Enable webkit_compositor_unittests

webkit/compositor/TiledLayerChromiumTest.cpp

+// Copyright 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#include "TiledLayerChromium.h"
+
+#include "BitmapCanvasLayerTextureUpdater.h"
+#include "CCAnimationTestCommon.h"
+#include "CCLayerTreeTestCommon.h"
+#include "CCOverdrawMetrics.h"
+#include "CCRenderingStats.h"
+#include "CCSingleThreadProxy.h" // For DebugScopedSetImplThread
+#include "CCTextureUpdateController.h"
+#include "CCTiledLayerTestCommon.h"
+#include "FakeCCGraphicsContext.h"
+#include "FakeCCLayerTreeHostClient.h"
+#include "LayerPainterChromium.h"
+#include <gtest/gtest.h>
+#include <public/WebCompositor.h>
+#include <public/WebTransformationMatrix.h>
+
+using namespace WebCore;
+using namespace WebKitTests;
+using namespace WTF;
+using WebKit::WebTransformationMatrix;
+
+#define EXPECT_EQ_RECT(a, b) \
+    EXPECT_EQ(a.x(), b.x()); \
+    EXPECT_EQ(a.y(), b.y()); \
+    EXPECT_EQ(a.width(), b.width()); \
+    EXPECT_EQ(a.height(), b.height());
+
+namespace {
+
+class TestCCOcclusionTracker : public CCOcclusionTracker {
+public:
+    TestCCOcclusionTracker()
+        : CCOcclusionTracker(IntRect(0, 0, 1000, 1000), true)
+        , m_layerClipRectInTarget(IntRect(0, 0, 1000, 1000))
+    {
+        // Pretend we have visited a render surface.
+        m_stack.append(StackObject());
+    }
+
+    void setOcclusion(const Region& occlusion) { m_stack.last().occlusionInScreen = occlusion; }
+
+protected:
+    virtual IntRect layerClipRectInTarget(const LayerChromium* layer) const OVERRIDE { return m_layerClipRectInTarget; }
+
+private:
+    IntRect m_layerClipRectInTarget;
+};
+
+class TiledLayerChromiumTest : public testing::Test {
+public:
+    TiledLayerChromiumTest()
+        : m_context(WebKit::createFakeCCGraphicsContext())
+        , m_textureManager(CCPrioritizedTextureManager::create(60*1024*1024, 1024, CCRenderer::ContentPool))
+        , m_occlusion(0)
+    {
+        DebugScopedSetImplThread implThread;
+        m_resourceProvider = CCResourceProvider::create(m_context.get());
+    }
+
+    virtual ~TiledLayerChromiumTest()
+    {
+        DebugScopedSetImplThread implThread;
+        m_resourceProvider.clear();
+    }
+
+    void updateTextures(int count = 500)
+    {
+        CCTextureUpdateController::updateTextures(m_resourceProvider.get(), &m_copier, &m_uploader, &m_queue, count);
+    }
+
+    bool updateAndPush(FakeTiledLayerChromium* layer1,
+                       CCLayerImpl* layerImpl1,
+                       FakeTiledLayerChromium* layer2 = 0,
+                       CCLayerImpl* layerImpl2 = 0)
+    {
+        // Get textures
+        m_textureManager->clearPriorities();
+        if (layer1)
+            layer1->setTexturePriorities(m_priorityCalculator);
+        if (layer2)
+            layer2->setTexturePriorities(m_priorityCalculator);     
+        m_textureManager->prioritizeTextures();
+
+        // Update content
+        if (layer1)
+            layer1->update(m_queue, m_occlusion, m_stats);
+        if (layer2)
+            layer2->update(m_queue, m_occlusion, m_stats);
+
+        bool needsUpdate = false;
+        if (layer1)
+            needsUpdate |= layer1->needsIdlePaint();
+        if (layer2)
+            needsUpdate |= layer2->needsIdlePaint();
+
+        // Update textures and push.
+        updateTextures();
+        if (layer1)
+            layer1->pushPropertiesTo(layerImpl1);
+        if (layer2)
+            layer2->pushPropertiesTo(layerImpl2);
+
+        return needsUpdate;
+    }
+
+public:
+    OwnPtr<CCGraphicsContext> m_context;
+    OwnPtr<CCResourceProvider> m_resourceProvider;
+    CCTextureUpdateQueue m_queue;
+    CCRenderingStats m_stats;
+    FakeTextureCopier m_copier;
+    FakeTextureUploader m_uploader;
+    CCPriorityCalculator m_priorityCalculator;
+    OwnPtr<CCPrioritizedTextureManager> m_textureManager;
+    TestCCOcclusionTracker* m_occlusion;
+};
+
+TEST_F(TiledLayerChromiumTest, pushDirtyTiles)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles.
+    layer->setBounds(IntSize(100, 200));
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 200));
+    layer->invalidateContentRect(IntRect(0, 0, 100, 200));
+    updateAndPush(layer.get(), layerImpl.get());
+
+    // We should have both tiles on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 1));
+
+    // Invalidates both tiles, but then only update one of them.
+    layer->setBounds(IntSize(100, 200));
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 100));
+    layer->invalidateContentRect(IntRect(0, 0, 100, 200));
+    updateAndPush(layer.get(), layerImpl.get());
+
+    // We should only have the first tile since the other tile was invalidated but not painted.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_FALSE(layerImpl->hasTileAt(0, 1));
+}
+
+TEST_F(TiledLayerChromiumTest, pushOccludedDirtyTiles)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+    TestCCOcclusionTracker occluded;
+    m_occlusion = &occluded;
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles.
+    layer->setBounds(IntSize(100, 200));
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 200));
+    layer->invalidateContentRect(IntRect(0, 0, 100, 200));
+    updateAndPush(layer.get(), layerImpl.get());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 20000, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    // We should have both tiles on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 1));
+
+    // Invalidates part of the top tile...
+    layer->invalidateContentRect(IntRect(0, 0, 50, 50));
+    // ....but the area is occluded.
+    occluded.setOcclusion(IntRect(0, 0, 50, 50));
+    updateAndPush(layer.get(), layerImpl.get());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 20000 + 2500, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    // We should still have both tiles, as part of the top tile is still unoccluded.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 1));
+}
+
+TEST_F(TiledLayerChromiumTest, pushDeletedTiles)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles.
+    layer->setBounds(IntSize(100, 200));
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 200));
+    layer->invalidateContentRect(IntRect(0, 0, 100, 200));
+    updateAndPush(layer.get(), layerImpl.get());
+
+    // We should have both tiles on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 1));
+
+    m_textureManager->clearPriorities();
+    m_textureManager->clearAllMemory(m_resourceProvider.get());
+    m_textureManager->setMaxMemoryLimitBytes(4*1024*1024);
+
+    // This should drop the tiles on the impl thread.
+    layer->pushPropertiesTo(layerImpl.get());
+
+    // We should now have no textures on the impl thread.
+    EXPECT_FALSE(layerImpl->hasTileAt(0, 0));
+    EXPECT_FALSE(layerImpl->hasTileAt(0, 1));
+
+    // This should recreate and update one of the deleted textures.
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 100));
+    updateAndPush(layer.get(), layerImpl.get());
+
+    // We should have one tiles on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_FALSE(layerImpl->hasTileAt(0, 1));
+}
+
+TEST_F(TiledLayerChromiumTest, pushIdlePaintTiles)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+    // The tile size is 100x100. Setup 5x5 tiles with one visible tile in the center.
+    // This paints 1 visible of the 25 invalid tiles.
+    layer->setBounds(IntSize(500, 500));
+    layer->setVisibleContentRect(IntRect(200, 200, 100, 100));
+    layer->invalidateContentRect(IntRect(0, 0, 500, 500));
+    bool needsUpdate = updateAndPush(layer.get(), layerImpl.get());
+    // We should need idle-painting for surrounding tiles.
+    EXPECT_TRUE(needsUpdate);
+
+    // We should have one tile on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(2, 2));
+
+    // For the next four updates, we should detect we still need idle painting.
+    for (int i = 0; i < 4; i++) {
+        needsUpdate = updateAndPush(layer.get(), layerImpl.get());
+        EXPECT_TRUE(needsUpdate);
+    }
+
+    // We should have one tile surrounding the visible tile on all sides, but no other tiles.
+    IntRect idlePaintTiles(1, 1, 3, 3);
+    for (int i = 0; i < 5; i++) {
+        for (int j = 0; j < 5; j++)
+            EXPECT_EQ(layerImpl->hasTileAt(i, j), idlePaintTiles.contains(i, j));
+    }
+
+    // We should always finish painting eventually.
+    for (int i = 0; i < 20; i++)
+        needsUpdate = updateAndPush(layer.get(), layerImpl.get());
+    EXPECT_FALSE(needsUpdate);
+}
+
+TEST_F(TiledLayerChromiumTest, pushTilesAfterIdlePaintFailed)
+{
+    // Start with 2mb of memory, but the test is going to try to use just more than 1mb, so we reduce to 1mb later.
+    m_textureManager->setMaxMemoryLimitBytes(2 * 1024 * 1024);    
+    DebugScopedSetImplThread implThread;
+    RefPtr<FakeTiledLayerChromium> layer1 = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl1(adoptPtr(new FakeCCTiledLayerImpl(1)));
+    RefPtr<FakeTiledLayerChromium> layer2 = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl2(adoptPtr(new FakeCCTiledLayerImpl(2)));
+
+    // For this test we have two layers. layer1 exhausts most texture memory, leaving room for 2 more tiles from
+    // layer2, but not all three tiles. First we paint layer1, and one tile from layer2. Then when we idle paint
+    // layer2, we will fail on the third tile of layer2, and this should not leave the second tile in a bad state.
+
+    // This uses 960000 bytes, leaving 88576 bytes of memory left, which is enough for 2 tiles only in the other layer.
+    IntRect layer1Rect(0, 0, 100, 2400);
+    
+    // This requires 4*30000 bytes of memory.
+    IntRect layer2Rect(0, 0, 100, 300);
+
+    // Paint a single tile in layer2 so that it will idle paint.
+    layer1->setBounds(layer1Rect.size());
+    layer1->setVisibleContentRect(layer1Rect);
+    layer2->setBounds(layer2Rect.size());
+    layer2->setVisibleContentRect(IntRect(0, 0, 100, 100));
+    bool needsUpdate = updateAndPush(layer1.get(), layerImpl1.get(),
+                                     layer2.get(), layerImpl2.get());
+    // We should need idle-painting for both remaining tiles in layer2.
+    EXPECT_TRUE(needsUpdate);
+
+    // Reduce our memory limits to 1mb.
+    m_textureManager->setMaxMemoryLimitBytes(1024 * 1024);
+
+    // Now idle paint layer2. We are going to run out of memory though!
+    // Oh well, commit the frame and push.
+    for (int i = 0; i < 4; i++) {
+        needsUpdate = updateAndPush(layer1.get(), layerImpl1.get(),
+                                    layer2.get(), layerImpl2.get());
+    }
+
+    // Sanity check, we should have textures for the big layer.
+    EXPECT_TRUE(layerImpl1->hasTextureIdForTileAt(0, 0));
+    EXPECT_TRUE(layerImpl1->hasTextureIdForTileAt(0, 23));
+
+    // We should only have the first two tiles from layer2 since
+    // it failed to idle update the last tile.
+    EXPECT_TRUE(layerImpl2->hasTileAt(0, 0));
+    EXPECT_TRUE(layerImpl2->hasTextureIdForTileAt(0, 0));
+    EXPECT_TRUE(layerImpl2->hasTileAt(0, 1));
+    EXPECT_TRUE(layerImpl2->hasTextureIdForTileAt(0, 1));
+    
+    EXPECT_FALSE(needsUpdate);
+    EXPECT_FALSE(layerImpl2->hasTileAt(0, 2));
+}
+
+TEST_F(TiledLayerChromiumTest, pushIdlePaintedOccludedTiles)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+    TestCCOcclusionTracker occluded;
+    m_occlusion = &occluded;
+    
+    // The tile size is 100x100, so this invalidates one occluded tile, culls it during paint, but prepaints it.
+    occluded.setOcclusion(IntRect(0, 0, 100, 100));
+
+    layer->setBounds(IntSize(100, 100));
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 100));
+    updateAndPush(layer.get(), layerImpl.get());
+
+    // We should have the prepainted tile on the impl side, but culled it during paint.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_EQ(1, occluded.overdrawMetrics().tilesCulledForUpload());
+}
+
+TEST_F(TiledLayerChromiumTest, pushTilesMarkedDirtyDuringPaint)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles.
+    // However, during the paint, we invalidate one of the tiles. This should
+    // not prevent the tile from being pushed.
+    layer->fakeLayerTextureUpdater()->setRectToInvalidate(IntRect(0, 50, 100, 50), layer.get());
+    layer->setBounds(IntSize(100, 200));
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 200));    
+    updateAndPush(layer.get(), layerImpl.get());
+
+    // We should have both tiles on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 1));
+}
+
+TEST_F(TiledLayerChromiumTest, pushTilesLayerMarkedDirtyDuringPaintOnNextLayer)
+{
+    RefPtr<FakeTiledLayerChromium> layer1 = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    RefPtr<FakeTiledLayerChromium> layer2 = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layer1Impl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+    OwnPtr<FakeCCTiledLayerImpl> layer2Impl(adoptPtr(new FakeCCTiledLayerImpl(2)));
+
+    // Invalidate a tile on layer1, during update of layer 2.
+    layer2->fakeLayerTextureUpdater()->setRectToInvalidate(IntRect(0, 50, 100, 50), layer1.get());
+    layer1->setBounds(IntSize(100, 200));
+    layer1->setVisibleContentRect(IntRect(0, 0, 100, 200));    
+    layer2->setBounds(IntSize(100, 200));
+    layer2->setVisibleContentRect(IntRect(0, 0, 100, 200));    
+    updateAndPush(layer1.get(), layer1Impl.get(),
+                  layer2.get(), layer2Impl.get());
+
+    // We should have both tiles on the impl side for all layers.
+    EXPECT_TRUE(layer1Impl->hasTileAt(0, 0));
+    EXPECT_TRUE(layer1Impl->hasTileAt(0, 1));
+    EXPECT_TRUE(layer2Impl->hasTileAt(0, 0));
+    EXPECT_TRUE(layer2Impl->hasTileAt(0, 1));
+}
+
+TEST_F(TiledLayerChromiumTest, pushTilesLayerMarkedDirtyDuringPaintOnPreviousLayer)
+{
+    RefPtr<FakeTiledLayerChromium> layer1 = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    RefPtr<FakeTiledLayerChromium> layer2 = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layer1Impl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+    OwnPtr<FakeCCTiledLayerImpl> layer2Impl(adoptPtr(new FakeCCTiledLayerImpl(2)));
+
+    layer1->fakeLayerTextureUpdater()->setRectToInvalidate(IntRect(0, 50, 100, 50), layer2.get());
+    layer1->setBounds(IntSize(100, 200));
+    layer1->setVisibleContentRect(IntRect(0, 0, 100, 200));    
+    layer2->setBounds(IntSize(100, 200));
+    layer2->setVisibleContentRect(IntRect(0, 0, 100, 200));    
+    updateAndPush(layer1.get(), layer1Impl.get(),
+                  layer2.get(), layer2Impl.get());
+
+    // We should have both tiles on the impl side for all layers.
+    EXPECT_TRUE(layer1Impl->hasTileAt(0, 0));
+    EXPECT_TRUE(layer1Impl->hasTileAt(0, 1));
+    EXPECT_TRUE(layer2Impl->hasTileAt(0, 0));
+    EXPECT_TRUE(layer2Impl->hasTileAt(0, 1));
+}
+
+TEST_F(TiledLayerChromiumTest, paintSmallAnimatedLayersImmediately)
+{
+    // Create a CCLayerTreeHost that has the right viewportsize,
+    // so the layer is considered small enough.
+    WebKit::WebCompositor::initialize(0);
+    FakeCCLayerTreeHostClient fakeCCLayerTreeHostClient;
+    OwnPtr<CCLayerTreeHost> ccLayerTreeHost = CCLayerTreeHost::create(&fakeCCLayerTreeHostClient, CCLayerTreeSettings());
+
+    bool runOutOfMemory[2] = {false, true};
+    for (int i = 0; i < 2; i++) {
+        // Create a layer with 4x4 tiles.
+        int layerWidth  = 4 * FakeTiledLayerChromium::tileSize().width();
+        int layerHeight = 4 * FakeTiledLayerChromium::tileSize().height();
+        int memoryForLayer = layerWidth * layerHeight * 4;
+        IntSize viewportSize = IntSize(layerWidth, layerHeight);
+        ccLayerTreeHost->setViewportSize(viewportSize, viewportSize);
+
+        // Use 8x4 tiles to run out of memory.
+        if (runOutOfMemory[i])
+            layerWidth *= 2;
+
+        m_textureManager->setMaxMemoryLimitBytes(memoryForLayer);
+        DebugScopedSetImplThread implThread;
+
+        RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+        OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+        // Full size layer with half being visible.
+        IntSize contentBounds(layerWidth, layerHeight);
+        IntRect contentRect(IntPoint::zero(), contentBounds);
+        IntRect visibleRect(IntPoint::zero(), IntSize(layerWidth / 2, layerHeight));
+
+        // Pretend the layer is animating.
+        layer->setDrawTransformIsAnimating(true);
+        layer->setBounds(contentBounds);
+        layer->setVisibleContentRect(visibleRect);
+        layer->invalidateContentRect(contentRect);
+        layer->setLayerTreeHost(ccLayerTreeHost.get());
+
+        // The layer should paint it's entire contents on the first paint
+        // if it is close to the viewport size and has the available memory.
+        layer->setTexturePriorities(m_priorityCalculator);
+        m_textureManager->prioritizeTextures();
+        layer->update(m_queue, 0, m_stats);
+        updateTextures();
+        layer->pushPropertiesTo(layerImpl.get());
+
+        // We should have all the tiles for the small animated layer.
+        // We should still have the visible tiles when we didn't
+        // have enough memory for all the tiles.
+        if (!runOutOfMemory[i]) {
+            for (int i = 0; i < 4; ++i) {
+                for (int j = 0; j < 4; ++j)
+                    EXPECT_TRUE(layerImpl->hasTileAt(i, j));
+            }
+        } else {
+            for (int i = 0; i < 8; ++i) {
+                for (int j = 0; j < 4; ++j)
+                    EXPECT_EQ(layerImpl->hasTileAt(i, j), i < 4);
+            }
+        }
+    }
+    ccLayerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+TEST_F(TiledLayerChromiumTest, idlePaintOutOfMemory)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+    // We have enough memory for only the visible rect, so we will run out of memory in first idle paint.
+    int memoryLimit = 4 * 100 * 100; // 1 tiles, 4 bytes per pixel.
+    m_textureManager->setMaxMemoryLimitBytes(memoryLimit);
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles.
+    bool needsUpdate = false;
+    layer->setBounds(IntSize(300, 300));
+    layer->setVisibleContentRect(IntRect(100, 100, 100, 100));
+    for (int i = 0; i < 2; i++)
+        needsUpdate = updateAndPush(layer.get(), layerImpl.get());
+
+    // Idle-painting should see no more priority tiles for painting.
+    EXPECT_FALSE(needsUpdate);
+
+    // We should have one tile on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(1, 1));
+}
+
+TEST_F(TiledLayerChromiumTest, idlePaintZeroSizedLayer)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+    bool animating[2] = {false, true};
+    for (int i = 0; i < 2; i++) {
+        // Pretend the layer is animating.
+        layer->setDrawTransformIsAnimating(animating[i]);
+
+        // The layer's bounds are empty.
+        // Empty layers don't paint or idle-paint.
+        layer->setBounds(IntSize());
+        layer->setVisibleContentRect(IntRect());
+        bool needsUpdate = updateAndPush(layer.get(), layerImpl.get());
+        
+        // Empty layers don't have tiles.
+        EXPECT_EQ(0u, layer->numPaintedTiles());
+
+        // Empty layers don't need prepaint.
+        EXPECT_FALSE(needsUpdate);
+
+        // Empty layers don't have tiles.
+        EXPECT_FALSE(layerImpl->hasTileAt(0, 0));
+    }
+}
+
+TEST_F(TiledLayerChromiumTest, idlePaintNonVisibleLayers)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+    // Alternate between not visible and visible.
+    IntRect v(0, 0, 100, 100);
+    IntRect nv(0, 0, 0, 0);
+    IntRect visibleRect[10] = {nv, nv, v, v, nv, nv, v, v, nv, nv};
+    bool invalidate[10] =  {true, true, true, true, true, true, true, true, false, false };
+
+    // We should not have any tiles except for when the layer was visible
+    // or after the layer was visible and we didn't invalidate.
+    bool haveTile[10] = { false, false, true, true, false, false, true, true, true, true };
+    
+    for (int i = 0; i < 10; i++) {
+        layer->setBounds(IntSize(100, 100));
+        layer->setVisibleContentRect(visibleRect[i]);
+
+        if (invalidate[i])
+            layer->invalidateContentRect(IntRect(0, 0, 100, 100));
+        bool needsUpdate = updateAndPush(layer.get(), layerImpl.get());
+        
+        // We should never signal idle paint, as we painted the entire layer
+        // or the layer was not visible.
+        EXPECT_FALSE(needsUpdate);
+        EXPECT_EQ(layerImpl->hasTileAt(0, 0), haveTile[i]);
+    }
+}
+
+TEST_F(TiledLayerChromiumTest, invalidateFromPrepare)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles.
+    layer->setBounds(IntSize(100, 200));
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 200));
+    updateAndPush(layer.get(), layerImpl.get());
+
+    // We should have both tiles on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 1));
+
+    layer->fakeLayerTextureUpdater()->clearPrepareCount();
+    // Invoke update again. As the layer is valid update shouldn't be invoked on
+    // the LayerTextureUpdater.
+    updateAndPush(layer.get(), layerImpl.get());
+    EXPECT_EQ(0, layer->fakeLayerTextureUpdater()->prepareCount());
+
+    // setRectToInvalidate triggers invalidateContentRect() being invoked from update.
+    layer->fakeLayerTextureUpdater()->setRectToInvalidate(IntRect(25, 25, 50, 50), layer.get());
+    layer->fakeLayerTextureUpdater()->clearPrepareCount();
+    layer->invalidateContentRect(IntRect(0, 0, 50, 50));
+    updateAndPush(layer.get(), layerImpl.get());
+    EXPECT_EQ(1, layer->fakeLayerTextureUpdater()->prepareCount());
+    layer->fakeLayerTextureUpdater()->clearPrepareCount();
+
+    // The layer should still be invalid as update invoked invalidate.
+    updateAndPush(layer.get(), layerImpl.get()); // visible
+    EXPECT_EQ(1, layer->fakeLayerTextureUpdater()->prepareCount());
+}
+
+TEST_F(TiledLayerChromiumTest, verifyUpdateRectWhenContentBoundsAreScaled)
+{
+    // The updateRect (that indicates what was actually painted) should be in
+    // layer space, not the content space.
+    RefPtr<FakeTiledLayerWithScaledBounds> layer = adoptRef(new FakeTiledLayerWithScaledBounds(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+
+    IntRect layerBounds(0, 0, 300, 200);
+    IntRect contentBounds(0, 0, 200, 250);
+
+    layer->setBounds(layerBounds.size());
+    layer->setContentBounds(contentBounds.size());
+    layer->setVisibleContentRect(contentBounds);
+
+    // On first update, the updateRect includes all tiles, even beyond the boundaries of the layer.
+    // However, it should still be in layer space, not content space.
+    layer->invalidateContentRect(contentBounds);
+
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, 0, m_stats);
+    EXPECT_FLOAT_RECT_EQ(FloatRect(0, 0, 300, 300 * 0.8), layer->updateRect());
+    updateTextures();
+
+    // After the tiles are updated once, another invalidate only needs to update the bounds of the layer.
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->invalidateContentRect(contentBounds);
+    layer->update(m_queue, 0, m_stats);
+    EXPECT_FLOAT_RECT_EQ(FloatRect(layerBounds), layer->updateRect());
+    updateTextures();
+
+    // Partial re-paint should also be represented by the updateRect in layer space, not content space.
+    IntRect partialDamage(30, 100, 10, 10);
+    layer->invalidateContentRect(partialDamage);
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, 0, m_stats);
+    EXPECT_FLOAT_RECT_EQ(FloatRect(45, 80, 15, 8), layer->updateRect());
+}
+
+TEST_F(TiledLayerChromiumTest, verifyInvalidationWhenContentsScaleChanges)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+
+    // Create a layer with one tile.
+    layer->setBounds(IntSize(100, 100));
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 100));
+
+    // Invalidate the entire layer.
+    layer->setNeedsDisplay();
+    EXPECT_FLOAT_RECT_EQ(FloatRect(0, 0, 100, 100), layer->lastNeedsDisplayRect());
+
+    // Push the tiles to the impl side and check that there is exactly one.
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, 0, m_stats);
+    updateTextures();
+    layer->pushPropertiesTo(layerImpl.get());
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_FALSE(layerImpl->hasTileAt(0, 1));
+    EXPECT_FALSE(layerImpl->hasTileAt(1, 0));
+    EXPECT_FALSE(layerImpl->hasTileAt(1, 1));
+
+    // Change the contents scale and verify that the content rectangle requiring painting
+    // is not scaled.
+    layer->setContentsScale(2);
+    layer->setVisibleContentRect(IntRect(0, 0, 200, 200));
+    EXPECT_FLOAT_RECT_EQ(FloatRect(0, 0, 100, 100), layer->lastNeedsDisplayRect());
+
+    // The impl side should get 2x2 tiles now.
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, 0, m_stats);
+    updateTextures();
+    layer->pushPropertiesTo(layerImpl.get());
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 1));
+    EXPECT_TRUE(layerImpl->hasTileAt(1, 0));
+    EXPECT_TRUE(layerImpl->hasTileAt(1, 1));
+
+    // Invalidate the entire layer again, but do not paint. All tiles should be gone now from the
+    // impl side.
+    layer->setNeedsDisplay();
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+
+    layer->pushPropertiesTo(layerImpl.get());
+    EXPECT_FALSE(layerImpl->hasTileAt(0, 0));
+    EXPECT_FALSE(layerImpl->hasTileAt(0, 1));
+    EXPECT_FALSE(layerImpl->hasTileAt(1, 0));
+    EXPECT_FALSE(layerImpl->hasTileAt(1, 1));
+}
+
+TEST_F(TiledLayerChromiumTest, skipsDrawGetsReset)
+{
+    // Initialize without threading support.
+    WebKit::WebCompositor::initialize(0);
+    FakeCCLayerTreeHostClient fakeCCLayerTreeHostClient;
+    OwnPtr<CCLayerTreeHost> ccLayerTreeHost = CCLayerTreeHost::create(&fakeCCLayerTreeHostClient, CCLayerTreeSettings());
+    ASSERT_TRUE(ccLayerTreeHost->initializeRendererIfNeeded());
+
+    // Create two 300 x 300 tiled layers.
+    IntSize contentBounds(300, 300);
+    IntRect contentRect(IntPoint::zero(), contentBounds);
+
+    // We have enough memory for only one of the two layers.
+    int memoryLimit = 4 * 300 * 300; // 4 bytes per pixel.
+
+    RefPtr<FakeTiledLayerChromium> rootLayer = adoptRef(new FakeTiledLayerChromium(ccLayerTreeHost->contentsTextureManager()));
+    RefPtr<FakeTiledLayerChromium> childLayer = adoptRef(new FakeTiledLayerChromium(ccLayerTreeHost->contentsTextureManager()));
+    rootLayer->addChild(childLayer);
+
+    rootLayer->setBounds(contentBounds);
+    rootLayer->setVisibleContentRect(contentRect);
+    rootLayer->setPosition(FloatPoint(0, 0));
+    childLayer->setBounds(contentBounds);
+    childLayer->setVisibleContentRect(contentRect);
+    childLayer->setPosition(FloatPoint(0, 0));
+    rootLayer->invalidateContentRect(contentRect);
+    childLayer->invalidateContentRect(contentRect);
+
+    ccLayerTreeHost->setRootLayer(rootLayer);
+    ccLayerTreeHost->setViewportSize(IntSize(300, 300), IntSize(300, 300));
+
+    ccLayerTreeHost->updateLayers(m_queue, memoryLimit);
+
+    // We'll skip the root layer.
+    EXPECT_TRUE(rootLayer->skipsDraw());
+    EXPECT_FALSE(childLayer->skipsDraw());
+
+    ccLayerTreeHost->commitComplete();
+
+    // Remove the child layer.
+    rootLayer->removeAllChildren();
+
+    ccLayerTreeHost->updateLayers(m_queue, memoryLimit);
+    EXPECT_FALSE(rootLayer->skipsDraw());
+
+    ccLayerTreeHost->contentsTextureManager()->clearAllMemory(m_resourceProvider.get());
+    ccLayerTreeHost->setRootLayer(0);
+    ccLayerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+TEST_F(TiledLayerChromiumTest, resizeToSmaller)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+
+    layer->setBounds(IntSize(700, 700));
+    layer->setVisibleContentRect(IntRect(0, 0, 700, 700));
+    layer->invalidateContentRect(IntRect(0, 0, 700, 700));
+
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, 0, m_stats);
+
+    layer->setBounds(IntSize(200, 200));
+    layer->invalidateContentRect(IntRect(0, 0, 200, 200));
+}
+
+TEST_F(TiledLayerChromiumTest, hugeLayerUpdateCrash)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+
+    int size = 1 << 30;
+    layer->setBounds(IntSize(size, size));
+    layer->setVisibleContentRect(IntRect(0, 0, 700, 700));
+    layer->invalidateContentRect(IntRect(0, 0, size, size));
+
+    // Ensure no crash for bounds where size * size would overflow an int.
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, 0, m_stats);
+}
+
+TEST_F(TiledLayerChromiumTest, partialUpdates)
+{
+    // Initialize without threading support.
+    WebKit::WebCompositor::initialize(0);
+
+    CCLayerTreeSettings settings;
+    settings.maxPartialTextureUpdates = 4;
+
+    FakeCCLayerTreeHostClient fakeCCLayerTreeHostClient;
+    OwnPtr<CCLayerTreeHost> ccLayerTreeHost = CCLayerTreeHost::create(&fakeCCLayerTreeHostClient, settings);
+    ASSERT_TRUE(ccLayerTreeHost->initializeRendererIfNeeded());
+
+    // Create one 300 x 200 tiled layer with 3 x 2 tiles.
+    IntSize contentBounds(300, 200);
+    IntRect contentRect(IntPoint::zero(), contentBounds);
+
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(ccLayerTreeHost->contentsTextureManager()));
+    layer->setBounds(contentBounds);
+    layer->setPosition(FloatPoint(0, 0));
+    layer->setVisibleContentRect(contentRect);
+    layer->invalidateContentRect(contentRect);
+
+    ccLayerTreeHost->setRootLayer(layer);
+    ccLayerTreeHost->setViewportSize(IntSize(300, 200), IntSize(300, 200));
+
+    // Full update of all 6 tiles.
+    ccLayerTreeHost->updateLayers(m_queue, std::numeric_limits<size_t>::max());
+    {
+        DebugScopedSetImplThread implThread;
+        OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+        updateTextures(4);
+        EXPECT_EQ(4, layer->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_TRUE(m_queue.hasMoreUpdates());
+        layer->fakeLayerTextureUpdater()->clearUpdateCount();
+        updateTextures(4);
+        EXPECT_EQ(2, layer->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_FALSE(m_queue.hasMoreUpdates());
+        layer->fakeLayerTextureUpdater()->clearUpdateCount();
+        layer->pushPropertiesTo(layerImpl.get());
+    }
+    ccLayerTreeHost->commitComplete();
+
+    // Full update of 3 tiles and partial update of 3 tiles.
+    layer->invalidateContentRect(IntRect(0, 0, 300, 150));
+    ccLayerTreeHost->updateLayers(m_queue, std::numeric_limits<size_t>::max());
+    {
+        DebugScopedSetImplThread implThread;
+        OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+        updateTextures(4);
+        EXPECT_EQ(3, layer->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_TRUE(m_queue.hasMoreUpdates());
+        layer->fakeLayerTextureUpdater()->clearUpdateCount();
+        updateTextures(4);
+        EXPECT_EQ(3, layer->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_FALSE(m_queue.hasMoreUpdates());
+        layer->fakeLayerTextureUpdater()->clearUpdateCount();
+        layer->pushPropertiesTo(layerImpl.get());
+    }
+    ccLayerTreeHost->commitComplete();
+
+    // Partial update of 6 tiles.
+    layer->invalidateContentRect(IntRect(50, 50, 200, 100));
+    {
+        DebugScopedSetImplThread implThread;
+        OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+        ccLayerTreeHost->updateLayers(m_queue, std::numeric_limits<size_t>::max());
+        updateTextures(4);
+        EXPECT_EQ(2, layer->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_TRUE(m_queue.hasMoreUpdates());
+        layer->fakeLayerTextureUpdater()->clearUpdateCount();
+        updateTextures(4);
+        EXPECT_EQ(4, layer->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_FALSE(m_queue.hasMoreUpdates());
+        layer->fakeLayerTextureUpdater()->clearUpdateCount();
+        layer->pushPropertiesTo(layerImpl.get());
+    }
+    ccLayerTreeHost->commitComplete();
+
+    // Checkerboard all tiles.
+    layer->invalidateContentRect(IntRect(0, 0, 300, 200));
+    {
+        DebugScopedSetImplThread implThread;
+        OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+        layer->pushPropertiesTo(layerImpl.get());
+    }
+    ccLayerTreeHost->commitComplete();
+
+    // Partial update of 6 checkerboard tiles.
+    layer->invalidateContentRect(IntRect(50, 50, 200, 100));
+    {
+        DebugScopedSetImplThread implThread;
+        OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+        ccLayerTreeHost->updateLayers(m_queue, std::numeric_limits<size_t>::max());
+        updateTextures(4);
+        EXPECT_EQ(4, layer->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_TRUE(m_queue.hasMoreUpdates());
+        layer->fakeLayerTextureUpdater()->clearUpdateCount();
+        updateTextures(4);
+        EXPECT_EQ(2, layer->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_FALSE(m_queue.hasMoreUpdates());
+        layer->fakeLayerTextureUpdater()->clearUpdateCount();
+        layer->pushPropertiesTo(layerImpl.get());
+    }
+    ccLayerTreeHost->commitComplete();
+
+    // Partial update of 4 tiles.
+    layer->invalidateContentRect(IntRect(50, 50, 100, 100));
+    {
+        DebugScopedSetImplThread implThread;
+        OwnPtr<FakeCCTiledLayerImpl> layerImpl(adoptPtr(new FakeCCTiledLayerImpl(1)));
+        ccLayerTreeHost->updateLayers(m_queue, std::numeric_limits<size_t>::max());
+        updateTextures(4);
+        EXPECT_EQ(4, layer->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_FALSE(m_queue.hasMoreUpdates());
+        layer->fakeLayerTextureUpdater()->clearUpdateCount();
+        layer->pushPropertiesTo(layerImpl.get());
+    }
+    ccLayerTreeHost->commitComplete();
+
+    {
+        DebugScopedSetImplThread implThread;
+        ccLayerTreeHost->contentsTextureManager()->clearAllMemory(m_resourceProvider.get());
+    }
+    ccLayerTreeHost->setRootLayer(0);
+    ccLayerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+TEST_F(TiledLayerChromiumTest, tilesPaintedWithoutOcclusion)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles.
+    layer->setBounds(IntSize(100, 200));
+    layer->setDrawableContentRect(IntRect(0, 0, 100, 200));
+    layer->setVisibleContentRect(IntRect(0, 0, 100, 200));
+    layer->invalidateContentRect(IntRect(0, 0, 100, 200));
+
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, 0, m_stats);
+    EXPECT_EQ(2, layer->fakeLayerTextureUpdater()->prepareRectCount());
+}
+
+TEST_F(TiledLayerChromiumTest, tilesPaintedWithOcclusion)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    TestCCOcclusionTracker occluded;
+
+    // The tile size is 100x100.
+
+    layer->setBounds(IntSize(600, 600));
+
+    occluded.setOcclusion(IntRect(200, 200, 300, 100));
+    layer->setDrawableContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->setVisibleContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(36-3, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 330000, 1);
+    EXPECT_EQ(3, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    layer->fakeLayerTextureUpdater()->clearPrepareRectCount();
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+
+    occluded.setOcclusion(IntRect(250, 200, 300, 100));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(36-2, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 330000 + 340000, 1);
+    EXPECT_EQ(3 + 2, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    layer->fakeLayerTextureUpdater()->clearPrepareRectCount();
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+
+    occluded.setOcclusion(IntRect(250, 250, 300, 100));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(36, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 330000 + 340000 + 360000, 1);
+    EXPECT_EQ(3 + 2, occluded.overdrawMetrics().tilesCulledForUpload());
+}
+
+TEST_F(TiledLayerChromiumTest, tilesPaintedWithOcclusionAndVisiblityConstraints)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    TestCCOcclusionTracker occluded;
+
+    // The tile size is 100x100.
+
+    layer->setBounds(IntSize(600, 600));
+
+    // The partially occluded tiles (by the 150 occlusion height) are visible beyond the occlusion, so not culled.
+    occluded.setOcclusion(IntRect(200, 200, 300, 150));
+    layer->setDrawableContentRect(IntRect(0, 0, 600, 360));
+    layer->setVisibleContentRect(IntRect(0, 0, 600, 360));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(24-3, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 210000, 1);
+    EXPECT_EQ(3, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    layer->fakeLayerTextureUpdater()->clearPrepareRectCount();
+
+    // Now the visible region stops at the edge of the occlusion so the partly visible tiles become fully occluded.
+    occluded.setOcclusion(IntRect(200, 200, 300, 150));
+    layer->setDrawableContentRect(IntRect(0, 0, 600, 350));
+    layer->setVisibleContentRect(IntRect(0, 0, 600, 350));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(24-6, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 210000 + 180000, 1);
+    EXPECT_EQ(3 + 6, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    layer->fakeLayerTextureUpdater()->clearPrepareRectCount();
+
+    // Now the visible region is even smaller than the occlusion, it should have the same result.
+    occluded.setOcclusion(IntRect(200, 200, 300, 150));
+    layer->setDrawableContentRect(IntRect(0, 0, 600, 340));
+    layer->setVisibleContentRect(IntRect(0, 0, 600, 340));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(24-6, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 210000 + 180000 + 180000, 1);
+    EXPECT_EQ(3 + 6 + 6, occluded.overdrawMetrics().tilesCulledForUpload());
+
+}
+
+TEST_F(TiledLayerChromiumTest, tilesNotPaintedWithoutInvalidation)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    TestCCOcclusionTracker occluded;
+
+    // The tile size is 100x100.
+
+    layer->setBounds(IntSize(600, 600));
+
+    occluded.setOcclusion(IntRect(200, 200, 300, 100));
+    layer->setDrawableContentRect(IntRect(0, 0, 600, 600));
+    layer->setVisibleContentRect(IntRect(0, 0, 600, 600));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(36-3, layer->fakeLayerTextureUpdater()->prepareRectCount());
+    {
+        DebugScopedSetImplThread implThread;
+        updateTextures();
+    }
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 330000, 1);
+    EXPECT_EQ(3, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    layer->fakeLayerTextureUpdater()->clearPrepareRectCount();
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+
+    // Repaint without marking it dirty. The 3 culled tiles will be pre-painted now.
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(3, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 330000, 1);
+    EXPECT_EQ(6, occluded.overdrawMetrics().tilesCulledForUpload());
+}
+
+TEST_F(TiledLayerChromiumTest, tilesPaintedWithOcclusionAndTransforms)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    TestCCOcclusionTracker occluded;
+
+    // The tile size is 100x100.
+
+    // This makes sure the painting works when the occluded region (in screen space)
+    // is transformed differently than the layer.
+    layer->setBounds(IntSize(600, 600));
+    WebTransformationMatrix screenTransform;
+    screenTransform.scale(0.5);
+    layer->setScreenSpaceTransform(screenTransform);
+    layer->setDrawTransform(screenTransform);
+
+    occluded.setOcclusion(IntRect(100, 100, 150, 50));
+    layer->setDrawableContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->setVisibleContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(36-3, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 330000, 1);
+    EXPECT_EQ(3, occluded.overdrawMetrics().tilesCulledForUpload());
+}
+
+TEST_F(TiledLayerChromiumTest, tilesPaintedWithOcclusionAndScaling)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    TestCCOcclusionTracker occluded;
+
+    // The tile size is 100x100.
+
+    // This makes sure the painting works when the content space is scaled to
+    // a different layer space. In this case tiles are scaled to be 200x200
+    // pixels, which means none should be occluded.
+    layer->setContentsScale(0.5);
+    layer->setBounds(IntSize(600, 600));
+    WebTransformationMatrix drawTransform;
+    drawTransform.scale(1 / layer->contentsScale());
+    layer->setDrawTransform(drawTransform);
+    layer->setScreenSpaceTransform(drawTransform);
+
+    occluded.setOcclusion(IntRect(200, 200, 300, 100));
+    layer->setDrawableContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->setVisibleContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, &occluded, m_stats);
+    // The content is half the size of the layer (so the number of tiles is fewer).
+    // In this case, the content is 300x300, and since the tile size is 100, the
+    // number of tiles 3x3.
+    EXPECT_EQ(9, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 90000, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    layer->fakeLayerTextureUpdater()->clearPrepareRectCount();
+
+    // This makes sure the painting works when the content space is scaled to
+    // a different layer space. In this case the occluded region catches the
+    // blown up tiles.
+    occluded.setOcclusion(IntRect(200, 200, 300, 200));
+    layer->setDrawableContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->setVisibleContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(9-1, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 90000 + 80000, 1);
+    EXPECT_EQ(1, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    layer->fakeLayerTextureUpdater()->clearPrepareRectCount();
+
+    // This makes sure content scaling and transforms work together.
+    WebTransformationMatrix screenTransform;
+    screenTransform.scale(0.5);
+    layer->setScreenSpaceTransform(screenTransform);
+    layer->setDrawTransform(screenTransform);
+
+    occluded.setOcclusion(IntRect(100, 100, 150, 100));
+    layer->setDrawableContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->setVisibleContentRect(IntRect(IntPoint(), layer->contentBounds()));
+    layer->invalidateContentRect(IntRect(0, 0, 600, 600));
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+    layer->update(m_queue, &occluded, m_stats);
+    EXPECT_EQ(9-1, layer->fakeLayerTextureUpdater()->prepareRectCount());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 90000 + 80000 + 80000, 1);
+    EXPECT_EQ(1 + 1, occluded.overdrawMetrics().tilesCulledForUpload());
+}
+
+TEST_F(TiledLayerChromiumTest, visibleContentOpaqueRegion)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    TestCCOcclusionTracker occluded;
+    DebugScopedSetImplThread implThread;
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles in various ways.
+
+    IntRect opaquePaintRect;
+    Region opaqueContents;
+
+    IntRect contentBounds = IntRect(0, 0, 100, 200);
+    IntRect visibleBounds = IntRect(0, 0, 100, 150);
+
+    layer->setBounds(contentBounds.size());
+    layer->setDrawableContentRect(visibleBounds);
+    layer->setVisibleContentRect(visibleBounds);
+    layer->setDrawOpacity(1);
+
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+
+    // If the layer doesn't paint opaque content, then the visibleContentOpaqueRegion should be empty.
+    layer->fakeLayerTextureUpdater()->setOpaquePaintRect(IntRect());
+    layer->invalidateContentRect(contentBounds);
+    layer->update(m_queue, &occluded, m_stats);
+    opaqueContents = layer->visibleContentOpaqueRegion();
+    EXPECT_TRUE(opaqueContents.isEmpty());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsPainted(), 20000, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 20000, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    // visibleContentOpaqueRegion should match the visible part of what is painted opaque.
+    opaquePaintRect = IntRect(10, 10, 90, 190);
+    layer->fakeLayerTextureUpdater()->setOpaquePaintRect(opaquePaintRect);
+    layer->invalidateContentRect(contentBounds);
+    layer->update(m_queue, &occluded, m_stats);
+    updateTextures();
+    opaqueContents = layer->visibleContentOpaqueRegion();
+    EXPECT_EQ_RECT(intersection(opaquePaintRect, visibleBounds), opaqueContents.bounds());
+    EXPECT_EQ(1u, opaqueContents.rects().size());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsPainted(), 20000 * 2, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 17100, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 20000 + 20000 - 17100, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    // If we paint again without invalidating, the same stuff should be opaque.
+    layer->fakeLayerTextureUpdater()->setOpaquePaintRect(IntRect());
+    layer->update(m_queue, &occluded, m_stats);
+    updateTextures();
+    opaqueContents = layer->visibleContentOpaqueRegion();
+    EXPECT_EQ_RECT(intersection(opaquePaintRect, visibleBounds), opaqueContents.bounds());
+    EXPECT_EQ(1u, opaqueContents.rects().size());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsPainted(), 20000 * 2, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 17100, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 20000 + 20000 - 17100, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    // If we repaint a non-opaque part of the tile, then it shouldn't lose its opaque-ness. And other tiles should
+    // not be affected.
+    layer->fakeLayerTextureUpdater()->setOpaquePaintRect(IntRect());
+    layer->invalidateContentRect(IntRect(0, 0, 1, 1));
+    layer->update(m_queue, &occluded, m_stats);
+    updateTextures();
+    opaqueContents = layer->visibleContentOpaqueRegion();
+    EXPECT_EQ_RECT(intersection(opaquePaintRect, visibleBounds), opaqueContents.bounds());
+    EXPECT_EQ(1u, opaqueContents.rects().size());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsPainted(), 20000 * 2 + 1, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 17100, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 20000 + 20000 - 17100 + 1, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    // If we repaint an opaque part of the tile, then it should lose its opaque-ness. But other tiles should still
+    // not be affected.
+    layer->fakeLayerTextureUpdater()->setOpaquePaintRect(IntRect());
+    layer->invalidateContentRect(IntRect(10, 10, 1, 1));
+    layer->update(m_queue, &occluded, m_stats);
+    updateTextures();
+    opaqueContents = layer->visibleContentOpaqueRegion();
+    EXPECT_EQ_RECT(intersection(IntRect(10, 100, 90, 100), visibleBounds), opaqueContents.bounds());
+    EXPECT_EQ(1u, opaqueContents.rects().size());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsPainted(), 20000 * 2 + 1  + 1, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 17100, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 20000 + 20000 - 17100 + 1 + 1, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+}
+
+TEST_F(TiledLayerChromiumTest, pixelsPaintedMetrics)
+{
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(m_textureManager.get()));
+    TestCCOcclusionTracker occluded;
+    DebugScopedSetImplThread implThread;
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles in various ways.
+
+    IntRect opaquePaintRect;
+    Region opaqueContents;
+
+    IntRect contentBounds = IntRect(0, 0, 100, 300);
+    IntRect visibleBounds = IntRect(0, 0, 100, 300);
+
+    layer->setBounds(contentBounds.size());
+    layer->setDrawableContentRect(visibleBounds);
+    layer->setVisibleContentRect(visibleBounds);
+    layer->setDrawOpacity(1);
+
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+
+    // Invalidates and paints the whole layer.
+    layer->fakeLayerTextureUpdater()->setOpaquePaintRect(IntRect());
+    layer->invalidateContentRect(contentBounds);
+    layer->update(m_queue, &occluded, m_stats);
+    updateTextures();
+    opaqueContents = layer->visibleContentOpaqueRegion();
+    EXPECT_TRUE(opaqueContents.isEmpty());
+
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsPainted(), 30000, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 30000, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+
+    // Invalidates an area on the top and bottom tile, which will cause us to paint the tile in the middle,
+    // even though it is not dirty and will not be uploaded.
+    layer->fakeLayerTextureUpdater()->setOpaquePaintRect(IntRect());
+    layer->invalidateContentRect(IntRect(0, 0, 1, 1));
+    layer->invalidateContentRect(IntRect(50, 200, 10, 10));
+    layer->update(m_queue, &occluded, m_stats);
+    updateTextures();
+    opaqueContents = layer->visibleContentOpaqueRegion();
+    EXPECT_TRUE(opaqueContents.isEmpty());
+
+    // The middle tile was painted even though not invalidated.
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsPainted(), 30000 + 60 * 210, 1);
+    // The pixels uploaded will not include the non-invalidated tile in the middle.
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedOpaque(), 0, 1);
+    EXPECT_NEAR(occluded.overdrawMetrics().pixelsUploadedTranslucent(), 30000 + 1 + 100, 1);
+    EXPECT_EQ(0, occluded.overdrawMetrics().tilesCulledForUpload());
+}
+
+TEST_F(TiledLayerChromiumTest, dontAllocateContentsWhenTargetSurfaceCantBeAllocated)
+{
+    // Initialize without threading support.
+    WebKit::WebCompositor::initialize(0);
+
+    // Tile size is 100x100.
+    IntRect rootRect(0, 0, 300, 200);
+    IntRect childRect(0, 0, 300, 100);
+    IntRect child2Rect(0, 100, 300, 100);
+
+    CCLayerTreeSettings settings;
+    FakeCCLayerTreeHostClient fakeCCLayerTreeHostClient;
+    OwnPtr<CCLayerTreeHost> ccLayerTreeHost = CCLayerTreeHost::create(&fakeCCLayerTreeHostClient, settings);
+    ASSERT_TRUE(ccLayerTreeHost->initializeRendererIfNeeded());
+
+    RefPtr<FakeTiledLayerChromium> root = adoptRef(new FakeTiledLayerChromium(ccLayerTreeHost->contentsTextureManager()));
+    RefPtr<LayerChromium> surface = LayerChromium::create();
+    RefPtr<FakeTiledLayerChromium> child = adoptRef(new FakeTiledLayerChromium(ccLayerTreeHost->contentsTextureManager()));
+    RefPtr<FakeTiledLayerChromium> child2 = adoptRef(new FakeTiledLayerChromium(ccLayerTreeHost->contentsTextureManager()));
+
+    root->setBounds(rootRect.size());
+    root->setAnchorPoint(FloatPoint());
+    root->setDrawableContentRect(rootRect);
+    root->setVisibleContentRect(rootRect);
+    root->addChild(surface);
+
+    surface->setForceRenderSurface(true);
+    surface->setAnchorPoint(FloatPoint());
+    surface->setOpacity(0.5);
+    surface->addChild(child);
+    surface->addChild(child2);
+
+    child->setBounds(childRect.size());
+    child->setAnchorPoint(FloatPoint());
+    child->setPosition(childRect.location());
+    child->setVisibleContentRect(childRect);
+    child->setDrawableContentRect(rootRect);
+
+    child2->setBounds(child2Rect.size());
+    child2->setAnchorPoint(FloatPoint());
+    child2->setPosition(child2Rect.location());
+    child2->setVisibleContentRect(child2Rect);
+    child2->setDrawableContentRect(rootRect);
+
+    ccLayerTreeHost->setRootLayer(root);
+    ccLayerTreeHost->setViewportSize(rootRect.size(), rootRect.size());
+
+    // With a huge memory limit, all layers should update and push their textures.
+    root->invalidateContentRect(rootRect);
+    child->invalidateContentRect(childRect);
+    child2->invalidateContentRect(child2Rect);
+    ccLayerTreeHost->updateLayers(m_queue, std::numeric_limits<size_t>::max());
+    {
+        DebugScopedSetImplThread implThread;
+        updateTextures(1000);
+        EXPECT_EQ(6, root->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_EQ(3, child->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_EQ(3, child2->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_FALSE(m_queue.hasMoreUpdates());
+
+        root->fakeLayerTextureUpdater()->clearUpdateCount();
+        child->fakeLayerTextureUpdater()->clearUpdateCount();
+        child2->fakeLayerTextureUpdater()->clearUpdateCount();
+
+        OwnPtr<FakeCCTiledLayerImpl> rootImpl(adoptPtr(new FakeCCTiledLayerImpl(root->id())));
+        OwnPtr<FakeCCTiledLayerImpl> childImpl(adoptPtr(new FakeCCTiledLayerImpl(child->id())));
+        OwnPtr<FakeCCTiledLayerImpl> child2Impl(adoptPtr(new FakeCCTiledLayerImpl(child2->id())));
+        root->pushPropertiesTo(rootImpl.get());
+        child->pushPropertiesTo(childImpl.get());
+        child2->pushPropertiesTo(child2Impl.get());
+
+        for (unsigned i = 0; i < 3; ++i) {
+            for (unsigned j = 0; j < 2; ++j)
+                EXPECT_TRUE(rootImpl->hasTextureIdForTileAt(i, j));
+            EXPECT_TRUE(childImpl->hasTextureIdForTileAt(i, 0));
+            EXPECT_TRUE(child2Impl->hasTextureIdForTileAt(i, 0));
+        }
+    }
+    ccLayerTreeHost->commitComplete();
+
+    // With a memory limit that includes only the root layer (3x2 tiles) and half the surface that
+    // the child layers draw into, the child layers will not be allocated. If the surface isn't
+    // accounted for, then one of the children would fit within the memory limit.
+    root->invalidateContentRect(rootRect);
+    child->invalidateContentRect(childRect);
+    child2->invalidateContentRect(child2Rect);
+    ccLayerTreeHost->updateLayers(m_queue, (3 * 2 + 3 * 1) * (100 * 100) * 4);
+    {
+        DebugScopedSetImplThread implThread;
+        updateTextures(1000);
+        EXPECT_EQ(6, root->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_EQ(0, child->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_EQ(0, child2->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_FALSE(m_queue.hasMoreUpdates());
+
+        root->fakeLayerTextureUpdater()->clearUpdateCount();
+        child->fakeLayerTextureUpdater()->clearUpdateCount();
+        child2->fakeLayerTextureUpdater()->clearUpdateCount();
+
+        OwnPtr<FakeCCTiledLayerImpl> rootImpl(adoptPtr(new FakeCCTiledLayerImpl(root->id())));
+        OwnPtr<FakeCCTiledLayerImpl> childImpl(adoptPtr(new FakeCCTiledLayerImpl(child->id())));
+        OwnPtr<FakeCCTiledLayerImpl> child2Impl(adoptPtr(new FakeCCTiledLayerImpl(child2->id())));
+        root->pushPropertiesTo(rootImpl.get());
+        child->pushPropertiesTo(childImpl.get());
+        child2->pushPropertiesTo(child2Impl.get());
+
+        for (unsigned i = 0; i < 3; ++i) {
+            for (unsigned j = 0; j < 2; ++j)
+                EXPECT_TRUE(rootImpl->hasTextureIdForTileAt(i, j));
+            EXPECT_FALSE(childImpl->hasTextureIdForTileAt(i, 0));
+            EXPECT_FALSE(child2Impl->hasTextureIdForTileAt(i, 0));
+        }
+    }
+    ccLayerTreeHost->commitComplete();
+
+    // With a memory limit that includes only half the root layer, no contents will be
+    // allocated. If render surface memory wasn't accounted for, there is enough space
+    // for one of the children layers, but they draw into a surface that can't be
+    // allocated.
+    root->invalidateContentRect(rootRect);
+    child->invalidateContentRect(childRect);
+    child2->invalidateContentRect(child2Rect);
+    ccLayerTreeHost->updateLayers(m_queue, (3 * 1) * (100 * 100) * 4);
+    {
+        DebugScopedSetImplThread implThread;
+        updateTextures(1000);
+        EXPECT_EQ(0, root->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_EQ(0, child->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_EQ(0, child2->fakeLayerTextureUpdater()->updateCount());
+        EXPECT_FALSE(m_queue.hasMoreUpdates());
+
+        root->fakeLayerTextureUpdater()->clearUpdateCount();
+        child->fakeLayerTextureUpdater()->clearUpdateCount();
+        child2->fakeLayerTextureUpdater()->clearUpdateCount();
+
+        OwnPtr<FakeCCTiledLayerImpl> rootImpl(adoptPtr(new FakeCCTiledLayerImpl(root->id())));
+        OwnPtr<FakeCCTiledLayerImpl> childImpl(adoptPtr(new FakeCCTiledLayerImpl(child->id())));
+        OwnPtr<FakeCCTiledLayerImpl> child2Impl(adoptPtr(new FakeCCTiledLayerImpl(child2->id())));
+        root->pushPropertiesTo(rootImpl.get());
+        child->pushPropertiesTo(childImpl.get());
+        child2->pushPropertiesTo(child2Impl.get());
+
+        for (unsigned i = 0; i < 3; ++i) {
+            for (unsigned j = 0; j < 2; ++j)
+                EXPECT_FALSE(rootImpl->hasTextureIdForTileAt(i, j));
+            EXPECT_FALSE(childImpl->hasTextureIdForTileAt(i, 0));
+            EXPECT_FALSE(child2Impl->hasTextureIdForTileAt(i, 0));
+        }
+    }
+    ccLayerTreeHost->commitComplete();
+
+    {
+        DebugScopedSetImplThread implThread;
+        ccLayerTreeHost->contentsTextureManager()->clearAllMemory(m_resourceProvider.get());
+    }
+    ccLayerTreeHost->setRootLayer(0);
+    ccLayerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+class TrackingLayerPainter : public LayerPainterChromium {
+public:
+    static PassOwnPtr<TrackingLayerPainter> create() { return adoptPtr(new TrackingLayerPainter()); }
+
+    virtual void paint(SkCanvas*, const IntRect& contentRect, FloatRect&) OVERRIDE
+    {
+        m_paintedRect = contentRect;
+    }
+
+    const IntRect& paintedRect() const { return m_paintedRect; }
+    void resetPaintedRect() { m_paintedRect = IntRect(); }
+
+private:
+    TrackingLayerPainter() { }
+
+    IntRect m_paintedRect;
+};
+
+class UpdateTrackingTiledLayerChromium : public FakeTiledLayerChromium {
+public:
+    explicit UpdateTrackingTiledLayerChromium(WebCore::CCPrioritizedTextureManager* manager)
+        : FakeTiledLayerChromium(manager)
+    {
+        OwnPtr<TrackingLayerPainter> trackingLayerPainter(TrackingLayerPainter::create());
+        m_trackingLayerPainter = trackingLayerPainter.get();
+        m_layerTextureUpdater = BitmapCanvasLayerTextureUpdater::create(trackingLayerPainter.release());
+    }
+    virtual ~UpdateTrackingTiledLayerChromium() { }
+
+    TrackingLayerPainter* trackingLayerPainter() const { return m_trackingLayerPainter; }
+
+protected:
+    virtual WebCore::LayerTextureUpdater* textureUpdater() const OVERRIDE { return m_layerTextureUpdater.get(); }
+
+private:
+    TrackingLayerPainter* m_trackingLayerPainter;
+    RefPtr<BitmapCanvasLayerTextureUpdater> m_layerTextureUpdater;
+};
+
+TEST_F(TiledLayerChromiumTest, nonIntegerContentsScaleIsNotDistortedDuringPaint)
+{
+    RefPtr<UpdateTrackingTiledLayerChromium> layer = adoptRef(new UpdateTrackingTiledLayerChromium(m_textureManager.get()));
+
+    IntRect layerRect(0, 0, 30, 31);
+    layer->setPosition(layerRect.location());
+    layer->setBounds(layerRect.size());
+    layer->setContentsScale(1.5);
+
+    IntRect contentRect(0, 0, 45, 47);
+    EXPECT_EQ(contentRect.size(), layer->contentBounds());
+    layer->setVisibleContentRect(contentRect);
+    layer->setDrawableContentRect(contentRect);
+
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+
+    // Update the whole tile.
+    layer->update(m_queue, 0, m_stats);
+    layer->trackingLayerPainter()->resetPaintedRect();
+
+    EXPECT_INT_RECT_EQ(IntRect(), layer->trackingLayerPainter()->paintedRect());
+
+    {
+        DebugScopedSetImplThread implThread;
+        updateTextures();
+    }
+
+    // Invalidate the entire layer in content space. When painting, the rect given to webkit should match the layer's bounds.
+    layer->invalidateContentRect(contentRect);
+    layer->update(m_queue, 0, m_stats);
+
+    EXPECT_INT_RECT_EQ(layerRect, layer->trackingLayerPainter()->paintedRect());
+}
+
+TEST_F(TiledLayerChromiumTest, nonIntegerContentsScaleIsNotDistortedDuringInvalidation)
+{
+    RefPtr<UpdateTrackingTiledLayerChromium> layer = adoptRef(new UpdateTrackingTiledLayerChromium(m_textureManager.get()));
+
+    IntRect layerRect(0, 0, 30, 31);
+    layer->setPosition(layerRect.location());
+    layer->setBounds(layerRect.size());
+    layer->setContentsScale(1.3f);
+
+    IntRect contentRect(IntPoint(), layer->contentBounds());
+    layer->setVisibleContentRect(contentRect);
+    layer->setDrawableContentRect(contentRect);
+
+    layer->setTexturePriorities(m_priorityCalculator);
+    m_textureManager->prioritizeTextures();
+
+    // Update the whole tile.
+    layer->update(m_queue, 0, m_stats);
+    layer->trackingLayerPainter()->resetPaintedRect();
+
+    EXPECT_INT_RECT_EQ(IntRect(), layer->trackingLayerPainter()->paintedRect());
+
+    {
+        DebugScopedSetImplThread implThread;
+        updateTextures();
+    }
+
+    // Invalidate the entire layer in layer space. When painting, the rect given to webkit should match the layer's bounds.
+    layer->setNeedsDisplayRect(layerRect);
+    layer->update(m_queue, 0, m_stats);
+
+    EXPECT_INT_RECT_EQ(layerRect, layer->trackingLayerPainter()->paintedRect());
+}
+
+} // namespace