Enable webkit_compositor_unittests

webkit/compositor/LayerChromiumTest.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 "LayerChromium.h"
+
+#include "CCLayerImpl.h"
+#include "CCLayerTreeHost.h"
+#include "CCLayerTreeTestCommon.h"
+#include "CCSingleThreadProxy.h"
+#include "FakeCCLayerTreeHostClient.h"
+#include "LayerPainterChromium.h"
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <public/WebCompositor.h>
+#include <public/WebTransformationMatrix.h>
+
+using namespace WebCore;
+using namespace WebKitTests;
+using WebKit::WebTransformationMatrix;
+using ::testing::Mock;
+using ::testing::_;
+using ::testing::AtLeast;
+using ::testing::AnyNumber;
+
+#define EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(numTimesExpectedSetNeedsCommit, codeToTest) do { \
+        EXPECT_CALL(*m_layerTreeHost, setNeedsCommit()).Times((numTimesExpectedSetNeedsCommit));      \
+        codeToTest;                                                                                   \
+        Mock::VerifyAndClearExpectations(m_layerTreeHost.get());                                      \
+    } while (0)
+
+namespace {
+
+class MockCCLayerTreeHost : public CCLayerTreeHost {
+public:
+    MockCCLayerTreeHost()
+        : CCLayerTreeHost(&m_fakeClient, CCLayerTreeSettings())
+    {
+        initialize();
+    }
+
+    MOCK_METHOD0(setNeedsCommit, void());
+
+private:
+    FakeCCLayerTreeHostClient m_fakeClient;
+};
+
+class MockLayerPainterChromium : public LayerPainterChromium {
+public:
+    virtual void paint(SkCanvas*, const IntRect&, FloatRect&) OVERRIDE { }
+};
+
+
+class LayerChromiumTest : public testing::Test {
+protected:
+    virtual void SetUp()
+    {
+        // Initialize without threading support.
+        WebKit::WebCompositor::initialize(0);
+        m_layerTreeHost = adoptPtr(new MockCCLayerTreeHost);
+    }
+
+    virtual void TearDown()
+    {
+        Mock::VerifyAndClearExpectations(m_layerTreeHost.get());
+        EXPECT_CALL(*m_layerTreeHost, setNeedsCommit()).Times(AnyNumber());
+        m_parent.clear();
+        m_child1.clear();
+        m_child2.clear();
+        m_child3.clear();
+        m_grandChild1.clear();
+        m_grandChild2.clear();
+        m_grandChild3.clear();
+
+        m_layerTreeHost->setRootLayer(0);
+        m_layerTreeHost.clear();
+        WebKit::WebCompositor::shutdown();
+    }
+
+    void verifyTestTreeInitialState() const
+    {
+        ASSERT_EQ(static_cast<size_t>(3), m_parent->children().size());
+        EXPECT_EQ(m_child1, m_parent->children()[0]);
+        EXPECT_EQ(m_child2, m_parent->children()[1]);
+        EXPECT_EQ(m_child3, m_parent->children()[2]);
+        EXPECT_EQ(m_parent.get(), m_child1->parent());
+        EXPECT_EQ(m_parent.get(), m_child2->parent());
+        EXPECT_EQ(m_parent.get(), m_child3->parent());
+
+        ASSERT_EQ(static_cast<size_t>(2), m_child1->children().size());
+        EXPECT_EQ(m_grandChild1, m_child1->children()[0]);
+        EXPECT_EQ(m_grandChild2, m_child1->children()[1]);
+        EXPECT_EQ(m_child1.get(), m_grandChild1->parent());
+        EXPECT_EQ(m_child1.get(), m_grandChild2->parent());
+
+        ASSERT_EQ(static_cast<size_t>(1), m_child2->children().size());
+        EXPECT_EQ(m_grandChild3, m_child2->children()[0]);
+        EXPECT_EQ(m_child2.get(), m_grandChild3->parent());
+
+        ASSERT_EQ(static_cast<size_t>(0), m_child3->children().size());
+    }
+
+    void createSimpleTestTree()
+    {
+        m_parent = LayerChromium::create();
+        m_child1 = LayerChromium::create();
+        m_child2 = LayerChromium::create();
+        m_child3 = LayerChromium::create();
+        m_grandChild1 = LayerChromium::create();
+        m_grandChild2 = LayerChromium::create();
+        m_grandChild3 = LayerChromium::create();
+
+        EXPECT_CALL(*m_layerTreeHost, setNeedsCommit()).Times(AnyNumber());
+        m_layerTreeHost->setRootLayer(m_parent);
+
+        m_parent->addChild(m_child1);
+        m_parent->addChild(m_child2);
+        m_parent->addChild(m_child3);
+        m_child1->addChild(m_grandChild1);
+        m_child1->addChild(m_grandChild2);
+        m_child2->addChild(m_grandChild3);
+
+        Mock::VerifyAndClearExpectations(m_layerTreeHost.get());
+
+        verifyTestTreeInitialState();
+    }
+
+    OwnPtr<MockCCLayerTreeHost> m_layerTreeHost;
+    RefPtr<LayerChromium> m_parent, m_child1, m_child2, m_child3, m_grandChild1, m_grandChild2, m_grandChild3;
+};
+
+TEST_F(LayerChromiumTest, basicCreateAndDestroy)
+{
+    RefPtr<LayerChromium> testLayer = LayerChromium::create();
+    ASSERT_TRUE(testLayer);
+
+    EXPECT_CALL(*m_layerTreeHost, setNeedsCommit()).Times(0);
+    testLayer->setLayerTreeHost(m_layerTreeHost.get());
+}
+
+TEST_F(LayerChromiumTest, addAndRemoveChild)
+{
+    RefPtr<LayerChromium> parent = LayerChromium::create();
+    RefPtr<LayerChromium> child = LayerChromium::create();
+
+    // Upon creation, layers should not have children or parent.
+    ASSERT_EQ(static_cast<size_t>(0), parent->children().size());
+    EXPECT_FALSE(child->parent());
+
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, m_layerTreeHost->setRootLayer(parent));
+
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, parent->addChild(child));
+
+    ASSERT_EQ(static_cast<size_t>(1), parent->children().size());
+    EXPECT_EQ(child.get(), parent->children()[0]);
+    EXPECT_EQ(parent.get(), child->parent());
+    EXPECT_EQ(parent.get(), child->rootLayer());
+
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(AtLeast(1), child->removeFromParent());
+}
+
+TEST_F(LayerChromiumTest, insertChild)
+{
+    RefPtr<LayerChromium> parent = LayerChromium::create();
+    RefPtr<LayerChromium> child1 = LayerChromium::create();
+    RefPtr<LayerChromium> child2 = LayerChromium::create();
+    RefPtr<LayerChromium> child3 = LayerChromium::create();
+    RefPtr<LayerChromium> child4 = LayerChromium::create();
+
+    parent->setLayerTreeHost(m_layerTreeHost.get());
+
+    ASSERT_EQ(static_cast<size_t>(0), parent->children().size());
+
+    // Case 1: inserting to empty list.
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, parent->insertChild(child3, 0));
+    ASSERT_EQ(static_cast<size_t>(1), parent->children().size());
+    EXPECT_EQ(child3, parent->children()[0]);
+    EXPECT_EQ(parent.get(), child3->parent());
+
+    // Case 2: inserting to beginning of list
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, parent->insertChild(child1, 0));
+    ASSERT_EQ(static_cast<size_t>(2), parent->children().size());
+    EXPECT_EQ(child1, parent->children()[0]);
+    EXPECT_EQ(child3, parent->children()[1]);
+    EXPECT_EQ(parent.get(), child1->parent());
+
+    // Case 3: inserting to middle of list
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, parent->insertChild(child2, 1));
+    ASSERT_EQ(static_cast<size_t>(3), parent->children().size());
+    EXPECT_EQ(child1, parent->children()[0]);
+    EXPECT_EQ(child2, parent->children()[1]);
+    EXPECT_EQ(child3, parent->children()[2]);
+    EXPECT_EQ(parent.get(), child2->parent());
+
+    // Case 4: inserting to end of list
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, parent->insertChild(child4, 3));
+
+    ASSERT_EQ(static_cast<size_t>(4), parent->children().size());
+    EXPECT_EQ(child1, parent->children()[0]);
+    EXPECT_EQ(child2, parent->children()[1]);
+    EXPECT_EQ(child3, parent->children()[2]);
+    EXPECT_EQ(child4, parent->children()[3]);
+    EXPECT_EQ(parent.get(), child4->parent());
+
+    EXPECT_CALL(*m_layerTreeHost, setNeedsCommit()).Times(AtLeast(1));
+}
+
+TEST_F(LayerChromiumTest, insertChildPastEndOfList)
+{
+    RefPtr<LayerChromium> parent = LayerChromium::create();
+    RefPtr<LayerChromium> child1 = LayerChromium::create();
+    RefPtr<LayerChromium> child2 = LayerChromium::create();
+
+    ASSERT_EQ(static_cast<size_t>(0), parent->children().size());
+
+    // insert to an out-of-bounds index
+    parent->insertChild(child1, 53);
+
+    ASSERT_EQ(static_cast<size_t>(1), parent->children().size());
+    EXPECT_EQ(child1, parent->children()[0]);
+
+    // insert another child to out-of-bounds, when list is not already empty.
+    parent->insertChild(child2, 2459);
+
+    ASSERT_EQ(static_cast<size_t>(2), parent->children().size());
+    EXPECT_EQ(child1, parent->children()[0]);
+    EXPECT_EQ(child2, parent->children()[1]);
+}
+
+TEST_F(LayerChromiumTest, insertSameChildTwice)
+{
+    RefPtr<LayerChromium> parent = LayerChromium::create();
+    RefPtr<LayerChromium> child1 = LayerChromium::create();
+    RefPtr<LayerChromium> child2 = LayerChromium::create();
+
+    parent->setLayerTreeHost(m_layerTreeHost.get());
+
+    ASSERT_EQ(static_cast<size_t>(0), parent->children().size());
+
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, parent->insertChild(child1, 0));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, parent->insertChild(child2, 1));
+
+    ASSERT_EQ(static_cast<size_t>(2), parent->children().size());
+    EXPECT_EQ(child1, parent->children()[0]);
+    EXPECT_EQ(child2, parent->children()[1]);
+
+    // Inserting the same child again should cause the child to be removed and re-inserted at the new location.
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(AtLeast(1), parent->insertChild(child1, 1));
+
+    // child1 should now be at the end of the list.
+    ASSERT_EQ(static_cast<size_t>(2), parent->children().size());
+    EXPECT_EQ(child2, parent->children()[0]);
+    EXPECT_EQ(child1, parent->children()[1]);
+
+    EXPECT_CALL(*m_layerTreeHost, setNeedsCommit()).Times(AtLeast(1));
+}
+
+TEST_F(LayerChromiumTest, replaceChildWithNewChild)
+{
+    createSimpleTestTree();
+    RefPtr<LayerChromium> child4 = LayerChromium::create();
+
+    EXPECT_FALSE(child4->parent());
+
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(AtLeast(1), m_parent->replaceChild(m_child2.get(), child4));
+
+    ASSERT_EQ(static_cast<size_t>(3), m_parent->children().size());
+    EXPECT_EQ(m_child1, m_parent->children()[0]);
+    EXPECT_EQ(child4, m_parent->children()[1]);
+    EXPECT_EQ(m_child3, m_parent->children()[2]);
+    EXPECT_EQ(m_parent.get(), child4->parent());
+
+    EXPECT_FALSE(m_child2->parent());
+}
+
+TEST_F(LayerChromiumTest, replaceChildWithNewChildThatHasOtherParent)
+{
+    createSimpleTestTree();
+
+    // create another simple tree with testLayer and child4.
+    RefPtr<LayerChromium> testLayer = LayerChromium::create();
+    RefPtr<LayerChromium> child4 = LayerChromium::create();
+    testLayer->addChild(child4);
+    ASSERT_EQ(static_cast<size_t>(1), testLayer->children().size());
+    EXPECT_EQ(child4, testLayer->children()[0]);
+    EXPECT_EQ(testLayer.get(), child4->parent());
+
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(AtLeast(1), m_parent->replaceChild(m_child2.get(), child4));
+
+    ASSERT_EQ(static_cast<size_t>(3), m_parent->children().size());
+    EXPECT_EQ(m_child1, m_parent->children()[0]);
+    EXPECT_EQ(child4, m_parent->children()[1]);
+    EXPECT_EQ(m_child3, m_parent->children()[2]);
+    EXPECT_EQ(m_parent.get(), child4->parent());
+
+    // testLayer should no longer have child4,
+    // and child2 should no longer have a parent.
+    ASSERT_EQ(static_cast<size_t>(0), testLayer->children().size());
+    EXPECT_FALSE(m_child2->parent());
+}
+
+TEST_F(LayerChromiumTest, replaceChildWithSameChild)
+{
+    createSimpleTestTree();
+
+    // setNeedsCommit should not be called because its the same child
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(0, m_parent->replaceChild(m_child2.get(), m_child2));
+
+    verifyTestTreeInitialState();
+}
+
+TEST_F(LayerChromiumTest, removeAllChildren)
+{
+    createSimpleTestTree();
+
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(AtLeast(3), m_parent->removeAllChildren());
+
+    ASSERT_EQ(static_cast<size_t>(0), m_parent->children().size());
+    EXPECT_FALSE(m_child1->parent());
+    EXPECT_FALSE(m_child2->parent());
+    EXPECT_FALSE(m_child3->parent());
+}
+
+TEST_F(LayerChromiumTest, setChildren)
+{
+    RefPtr<LayerChromium> oldParent = LayerChromium::create();
+    RefPtr<LayerChromium> newParent = LayerChromium::create();
+
+    RefPtr<LayerChromium> child1 = LayerChromium::create();
+    RefPtr<LayerChromium> child2 = LayerChromium::create();
+
+    Vector<RefPtr<LayerChromium> > newChildren;
+    newChildren.append(child1);
+    newChildren.append(child2);
+
+    // Set up and verify initial test conditions: child1 has a parent, child2 has no parent.
+    oldParent->addChild(child1);
+    ASSERT_EQ(static_cast<size_t>(0), newParent->children().size());
+    EXPECT_EQ(oldParent.get(), child1->parent());
+    EXPECT_FALSE(child2->parent());
+
+    newParent->setLayerTreeHost(m_layerTreeHost.get());
+
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(AtLeast(1), newParent->setChildren(newChildren));
+
+    ASSERT_EQ(static_cast<size_t>(2), newParent->children().size());
+    EXPECT_EQ(newParent.get(), child1->parent());
+    EXPECT_EQ(newParent.get(), child2->parent());
+
+    EXPECT_CALL(*m_layerTreeHost, setNeedsCommit()).Times(AtLeast(1));
+}
+
+TEST_F(LayerChromiumTest, getRootLayerAfterTreeManipulations)
+{
+    createSimpleTestTree();
+
+    // For this test we don't care about setNeedsCommit calls.
+    EXPECT_CALL(*m_layerTreeHost, setNeedsCommit()).Times(AtLeast(1));
+
+    RefPtr<LayerChromium> child4 = LayerChromium::create();
+
+    EXPECT_EQ(m_parent.get(), m_parent->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child1->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child2->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child3->rootLayer());
+    EXPECT_EQ(child4.get(),   child4->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_grandChild1->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_grandChild2->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_grandChild3->rootLayer());
+
+    m_child1->removeFromParent();
+
+    // child1 and its children, grandChild1 and grandChild2 are now on a separate subtree.
+    EXPECT_EQ(m_parent.get(), m_parent->rootLayer());
+    EXPECT_EQ(m_child1.get(), m_child1->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child2->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child3->rootLayer());
+    EXPECT_EQ(child4.get(), child4->rootLayer());
+    EXPECT_EQ(m_child1.get(), m_grandChild1->rootLayer());
+    EXPECT_EQ(m_child1.get(), m_grandChild2->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_grandChild3->rootLayer());
+
+    m_grandChild3->addChild(child4);
+
+    EXPECT_EQ(m_parent.get(), m_parent->rootLayer());
+    EXPECT_EQ(m_child1.get(), m_child1->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child2->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child3->rootLayer());
+    EXPECT_EQ(m_parent.get(), child4->rootLayer());
+    EXPECT_EQ(m_child1.get(), m_grandChild1->rootLayer());
+    EXPECT_EQ(m_child1.get(), m_grandChild2->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_grandChild3->rootLayer());
+
+    m_child2->replaceChild(m_grandChild3.get(), m_child1);
+
+    // grandChild3 gets orphaned and the child1 subtree gets planted back into the tree under child2.
+    EXPECT_EQ(m_parent.get(), m_parent->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child1->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child2->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_child3->rootLayer());
+    EXPECT_EQ(m_grandChild3.get(), child4->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_grandChild1->rootLayer());
+    EXPECT_EQ(m_parent.get(), m_grandChild2->rootLayer());
+    EXPECT_EQ(m_grandChild3.get(), m_grandChild3->rootLayer());
+}
+
+TEST_F(LayerChromiumTest, checkSetNeedsDisplayCausesCorrectBehavior)
+{
+    // The semantics for setNeedsDisplay which are tested here:
+    //   1. sets needsDisplay flag appropriately.
+    //   2. indirectly calls setNeedsCommit, exactly once for each call to setNeedsDisplay.
+
+    RefPtr<LayerChromium> testLayer = LayerChromium::create();
+    testLayer->setLayerTreeHost(m_layerTreeHost.get());
+
+    IntSize testBounds = IntSize(501, 508);
+
+    FloatRect dirty1 = FloatRect(10, 15, 1, 2);
+    FloatRect dirty2 = FloatRect(20, 25, 3, 4);
+    FloatRect emptyDirtyRect = FloatRect(40, 45, 0, 0);
+    FloatRect outOfBoundsDirtyRect = FloatRect(400, 405, 500, 502);
+
+    // Before anything, testLayer should not be dirty.
+    EXPECT_FALSE(testLayer->needsDisplay());
+
+    // This is just initialization, but setNeedsCommit behavior is verified anyway to avoid warnings.
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setBounds(testBounds));
+    testLayer = LayerChromium::create();
+    testLayer->setLayerTreeHost(m_layerTreeHost.get());
+    EXPECT_FALSE(testLayer->needsDisplay());
+
+    // The real test begins here.
+
+    // Case 1: needsDisplay flag should not change because of an empty dirty rect.
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setNeedsDisplayRect(emptyDirtyRect));
+    EXPECT_FALSE(testLayer->needsDisplay());
+
+    // Case 2: basic.
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setNeedsDisplayRect(dirty1));
+    EXPECT_TRUE(testLayer->needsDisplay());
+
+    // Case 3: a second dirty rect.
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setNeedsDisplayRect(dirty2));
+    EXPECT_TRUE(testLayer->needsDisplay());
+
+    // Case 4: LayerChromium should accept dirty rects that go beyond its bounds.
+    testLayer = LayerChromium::create();
+    testLayer->setLayerTreeHost(m_layerTreeHost.get());
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setBounds(testBounds));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setNeedsDisplayRect(outOfBoundsDirtyRect));
+    EXPECT_TRUE(testLayer->needsDisplay());
+
+    // Case 5: setNeedsDisplay() without the dirty rect arg.
+    testLayer = LayerChromium::create();
+    testLayer->setLayerTreeHost(m_layerTreeHost.get());
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setBounds(testBounds));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setNeedsDisplay());
+    EXPECT_TRUE(testLayer->needsDisplay());
+}
+
+TEST_F(LayerChromiumTest, checkPropertyChangeCausesCorrectBehavior)
+{
+    RefPtr<LayerChromium> testLayer = LayerChromium::create();
+    testLayer->setLayerTreeHost(m_layerTreeHost.get());
+
+    RefPtr<LayerChromium> dummyLayer = LayerChromium::create(); // just a dummy layer for this test case.
+
+    // sanity check of initial test condition
+    EXPECT_FALSE(testLayer->needsDisplay());
+
+    // Test properties that should not call needsDisplay and needsCommit when changed.
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(0, testLayer->setVisibleContentRect(IntRect(0, 0, 40, 50)));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(0, testLayer->setUseLCDText(true));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(0, testLayer->setDrawOpacity(0.5));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(0, testLayer->setRenderTarget(0));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(0, testLayer->setDrawTransform(WebTransformationMatrix()));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(0, testLayer->setScreenSpaceTransform(WebTransformationMatrix()));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(0, testLayer->setDrawableContentRect(IntRect(4, 5, 6, 7)));
+    EXPECT_FALSE(testLayer->needsDisplay());
+
+    // Next, test properties that should call setNeedsCommit (but not setNeedsDisplay)
+    // All properties need to be set to new values in order for setNeedsCommit to be called.
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setAnchorPoint(FloatPoint(1.23f, 4.56f)));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setAnchorPointZ(0.7f));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setBackgroundColor(SK_ColorLTGRAY));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setMasksToBounds(true));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setMaskLayer(dummyLayer.get()));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setOpacity(0.5));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setOpaque(true));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setPosition(FloatPoint(4, 9)));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setReplicaLayer(dummyLayer.get()));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setSublayerTransform(WebTransformationMatrix(0, 0, 0, 0, 0, 0)));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setScrollable(true));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setShouldScrollOnMainThread(true));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setNonFastScrollableRegion(Region(IntRect(1, 1, 2, 2))));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setHaveWheelEventHandlers(true));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setScrollPosition(IntPoint(10, 10)));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setTransform(WebTransformationMatrix(0, 0, 0, 0, 0, 0)));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setDoubleSided(false));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setDebugName("Test Layer"));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setDrawCheckerboardForMissingTiles(!testLayer->drawCheckerboardForMissingTiles()));
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setForceRenderSurface(true));
+
+    // The above tests should not have caused a change to the needsDisplay flag.
+    EXPECT_FALSE(testLayer->needsDisplay());
+
+    // Test properties that should call setNeedsDisplay and setNeedsCommit
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setBounds(IntSize(5, 10)));
+    EXPECT_TRUE(testLayer->needsDisplay());
+}
+
+TEST_F(LayerChromiumTest, verifyPushPropertiesAccumulatesUpdateRect)
+{
+    DebugScopedSetImplThread setImplThread;
+
+    RefPtr<LayerChromium> testLayer = LayerChromium::create();
+    OwnPtr<CCLayerImpl> implLayer = CCLayerImpl::create(1);
+
+    testLayer->setNeedsDisplayRect(FloatRect(FloatPoint::zero(), FloatSize(5, 5)));
+    testLayer->pushPropertiesTo(implLayer.get());
+    EXPECT_FLOAT_RECT_EQ(FloatRect(FloatPoint::zero(), FloatSize(5, 5)), implLayer->updateRect());
+
+    // The CCLayerImpl's updateRect should be accumulated here, since we did not do anything to clear it.
+    testLayer->setNeedsDisplayRect(FloatRect(FloatPoint(10, 10), FloatSize(5, 5)));
+    testLayer->pushPropertiesTo(implLayer.get());
+    EXPECT_FLOAT_RECT_EQ(FloatRect(FloatPoint::zero(), FloatSize(15, 15)), implLayer->updateRect());
+
+    // If we do clear the CCLayerImpl side, then the next updateRect should be fresh without accumulation.
+    implLayer->resetAllChangeTrackingForSubtree();
+    testLayer->setNeedsDisplayRect(FloatRect(FloatPoint(10, 10), FloatSize(5, 5)));
+    testLayer->pushPropertiesTo(implLayer.get());
+    EXPECT_FLOAT_RECT_EQ(FloatRect(FloatPoint(10, 10), FloatSize(5, 5)), implLayer->updateRect());
+}
+
+class LayerChromiumWithContentScaling : public LayerChromium {
+public:
+    explicit LayerChromiumWithContentScaling()
+        : LayerChromium()
+    {
+    }
+
+    virtual bool needsContentsScale() const OVERRIDE
+    {
+        return true;
+    }
+
+    virtual void setNeedsDisplayRect(const FloatRect& dirtyRect) OVERRIDE
+    {
+        m_lastNeedsDisplayRect = dirtyRect;
+        LayerChromium::setNeedsDisplayRect(dirtyRect);
+    }
+
+    void resetNeedsDisplay()
+    {
+        m_needsDisplay = false;
+    }
+
+    const FloatRect& lastNeedsDisplayRect() const { return m_lastNeedsDisplayRect; }
+
+private:
+    FloatRect m_lastNeedsDisplayRect;
+};
+
+TEST_F(LayerChromiumTest, checkContentsScaleChangeTriggersNeedsDisplay)
+{
+    RefPtr<LayerChromiumWithContentScaling> testLayer = adoptRef(new LayerChromiumWithContentScaling());
+    testLayer->setLayerTreeHost(m_layerTreeHost.get());
+
+    IntSize testBounds = IntSize(320, 240);
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setBounds(testBounds));
+
+    testLayer->resetNeedsDisplay();
+    EXPECT_FALSE(testLayer->needsDisplay());
+
+    EXECUTE_AND_VERIFY_SET_NEEDS_COMMIT_BEHAVIOR(1, testLayer->setContentsScale(testLayer->contentsScale() + 1.f));
+    EXPECT_TRUE(testLayer->needsDisplay());
+    EXPECT_FLOAT_RECT_EQ(FloatRect(0, 0, 320, 240), testLayer->lastNeedsDisplayRect());
+}
+
+class FakeCCLayerTreeHost : public CCLayerTreeHost {
+public:
+    static PassOwnPtr<FakeCCLayerTreeHost> create()
+    {
+        OwnPtr<FakeCCLayerTreeHost> host(adoptPtr(new FakeCCLayerTreeHost));
+        // The initialize call will fail, since our client doesn't provide a valid GraphicsContext3D, but it doesn't matter in the tests that use this fake so ignore the return value.
+        host->initialize();
+        return host.release();
+    }
+
+private:
+    FakeCCLayerTreeHost()
+        : CCLayerTreeHost(&m_client, CCLayerTreeSettings())
+    {
+    }
+
+    FakeCCLayerTreeHostClient m_client;
+};
+
+void assertLayerTreeHostMatchesForSubtree(LayerChromium* layer, CCLayerTreeHost* host)
+{
+    EXPECT_EQ(host, layer->layerTreeHost());
+
+    for (size_t i = 0; i < layer->children().size(); ++i)
+        assertLayerTreeHostMatchesForSubtree(layer->children()[i].get(), host);
+
+    if (layer->maskLayer())
+        assertLayerTreeHostMatchesForSubtree(layer->maskLayer(), host);
+
+    if (layer->replicaLayer())
+        assertLayerTreeHostMatchesForSubtree(layer->replicaLayer(), host);
+}
+
+
+TEST(LayerChromiumLayerTreeHostTest, enteringTree)
+{
+    WebKit::WebCompositor::initialize(0);
+    RefPtr<LayerChromium> parent = LayerChromium::create();
+    RefPtr<LayerChromium> child = LayerChromium::create();
+    RefPtr<LayerChromium> mask = LayerChromium::create();
+    RefPtr<LayerChromium> replica = LayerChromium::create();
+    RefPtr<LayerChromium> replicaMask = LayerChromium::create();
+
+    // Set up a detached tree of layers. The host pointer should be nil for these layers.
+    parent->addChild(child);
+    child->setMaskLayer(mask.get());
+    child->setReplicaLayer(replica.get());
+    replica->setMaskLayer(mask.get());
+
+    assertLayerTreeHostMatchesForSubtree(parent.get(), 0);
+
+    OwnPtr<FakeCCLayerTreeHost> layerTreeHost(FakeCCLayerTreeHost::create());
+    // Setting the root layer should set the host pointer for all layers in the tree.
+    layerTreeHost->setRootLayer(parent.get());
+
+    assertLayerTreeHostMatchesForSubtree(parent.get(), layerTreeHost.get());
+
+    // Clearing the root layer should also clear out the host pointers for all layers in the tree.
+    layerTreeHost->setRootLayer(0);
+
+    assertLayerTreeHostMatchesForSubtree(parent.get(), 0);
+
+    layerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+TEST(LayerChromiumLayerTreeHostTest, addingLayerSubtree)
+{
+    WebKit::WebCompositor::initialize(0);
+    RefPtr<LayerChromium> parent = LayerChromium::create();
+    OwnPtr<FakeCCLayerTreeHost> layerTreeHost(FakeCCLayerTreeHost::create());
+
+    layerTreeHost->setRootLayer(parent.get());
+
+    EXPECT_EQ(parent->layerTreeHost(), layerTreeHost.get());
+
+    // Adding a subtree to a layer already associated with a host should set the host pointer on all layers in that subtree.
+    RefPtr<LayerChromium> child = LayerChromium::create();
+    RefPtr<LayerChromium> grandChild = LayerChromium::create();
+    child->addChild(grandChild);
+
+    // Masks, replicas, and replica masks should pick up the new host too.
+    RefPtr<LayerChromium> childMask = LayerChromium::create();
+    child->setMaskLayer(childMask.get());
+    RefPtr<LayerChromium> childReplica = LayerChromium::create();
+    child->setReplicaLayer(childReplica.get());
+    RefPtr<LayerChromium> childReplicaMask = LayerChromium::create();
+    childReplica->setMaskLayer(childReplicaMask.get());
+
+    parent->addChild(child);
+    assertLayerTreeHostMatchesForSubtree(parent.get(), layerTreeHost.get());
+
+    layerTreeHost->setRootLayer(0);
+    layerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+TEST(LayerChromiumLayerTreeHostTest, changeHost)
+{
+    WebKit::WebCompositor::initialize(0);
+    RefPtr<LayerChromium> parent = LayerChromium::create();
+    RefPtr<LayerChromium> child = LayerChromium::create();
+    RefPtr<LayerChromium> mask = LayerChromium::create();
+    RefPtr<LayerChromium> replica = LayerChromium::create();
+    RefPtr<LayerChromium> replicaMask = LayerChromium::create();
+
+    // Same setup as the previous test.
+    parent->addChild(child);
+    child->setMaskLayer(mask.get());
+    child->setReplicaLayer(replica.get());
+    replica->setMaskLayer(mask.get());
+
+    OwnPtr<FakeCCLayerTreeHost> firstLayerTreeHost(FakeCCLayerTreeHost::create());
+    firstLayerTreeHost->setRootLayer(parent.get());
+
+    assertLayerTreeHostMatchesForSubtree(parent.get(), firstLayerTreeHost.get());
+
+    // Now re-root the tree to a new host (simulating what we do on a context lost event).
+    // This should update the host pointers for all layers in the tree.
+    OwnPtr<FakeCCLayerTreeHost> secondLayerTreeHost(FakeCCLayerTreeHost::create());
+    secondLayerTreeHost->setRootLayer(parent.get());
+
+    assertLayerTreeHostMatchesForSubtree(parent.get(), secondLayerTreeHost.get());
+
+    secondLayerTreeHost->setRootLayer(0);
+    firstLayerTreeHost.clear();
+    secondLayerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+TEST(LayerChromiumLayerTreeHostTest, changeHostInSubtree)
+{
+    WebKit::WebCompositor::initialize(0);
+    RefPtr<LayerChromium> firstParent = LayerChromium::create();
+    RefPtr<LayerChromium> firstChild = LayerChromium::create();
+    RefPtr<LayerChromium> secondParent = LayerChromium::create();
+    RefPtr<LayerChromium> secondChild = LayerChromium::create();
+    RefPtr<LayerChromium> secondGrandChild = LayerChromium::create();
+
+    // First put all children under the first parent and set the first host.
+    firstParent->addChild(firstChild);
+    secondChild->addChild(secondGrandChild);
+    firstParent->addChild(secondChild);
+
+    OwnPtr<FakeCCLayerTreeHost> firstLayerTreeHost(FakeCCLayerTreeHost::create());
+    firstLayerTreeHost->setRootLayer(firstParent.get());
+
+    assertLayerTreeHostMatchesForSubtree(firstParent.get(), firstLayerTreeHost.get());
+
+    // Now reparent the subtree starting at secondChild to a layer in a different tree.
+    OwnPtr<FakeCCLayerTreeHost> secondLayerTreeHost(FakeCCLayerTreeHost::create());
+    secondLayerTreeHost->setRootLayer(secondParent.get());
+
+    secondParent->addChild(secondChild);
+
+    // The moved layer and its children should point to the new host.
+    EXPECT_EQ(secondLayerTreeHost.get(), secondChild->layerTreeHost());
+    EXPECT_EQ(secondLayerTreeHost.get(), secondGrandChild->layerTreeHost());
+
+    // Test over, cleanup time.
+    firstLayerTreeHost->setRootLayer(0);
+    secondLayerTreeHost->setRootLayer(0);
+    firstLayerTreeHost.clear();
+    secondLayerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+TEST(LayerChromiumLayerTreeHostTest, replaceMaskAndReplicaLayer)
+{
+    WebKit::WebCompositor::initialize(0);
+    RefPtr<LayerChromium> parent = LayerChromium::create();
+    RefPtr<LayerChromium> mask = LayerChromium::create();
+    RefPtr<LayerChromium> replica = LayerChromium::create();
+    RefPtr<LayerChromium> maskChild = LayerChromium::create();
+    RefPtr<LayerChromium> replicaChild = LayerChromium::create();
+    RefPtr<LayerChromium> maskReplacement = LayerChromium::create();
+    RefPtr<LayerChromium> replicaReplacement = LayerChromium::create();
+
+    parent->setMaskLayer(mask.get());
+    parent->setReplicaLayer(replica.get());
+    mask->addChild(maskChild);
+    replica->addChild(replicaChild);
+
+    OwnPtr<FakeCCLayerTreeHost> layerTreeHost(FakeCCLayerTreeHost::create());
+    layerTreeHost->setRootLayer(parent.get());
+
+    assertLayerTreeHostMatchesForSubtree(parent.get(), layerTreeHost.get());
+
+    // Replacing the mask should clear out the old mask's subtree's host pointers.
+    parent->setMaskLayer(maskReplacement.get());
+    EXPECT_EQ(0, mask->layerTreeHost());
+    EXPECT_EQ(0, maskChild->layerTreeHost());
+
+    // Same for replacing a replica layer.
+    parent->setReplicaLayer(replicaReplacement.get());
+    EXPECT_EQ(0, replica->layerTreeHost());
+    EXPECT_EQ(0, replicaChild->layerTreeHost());
+
+    // Test over, cleanup time.
+    layerTreeHost->setRootLayer(0);
+    layerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+TEST(LayerChromiumLayerTreeHostTest, destroyHostWithNonNullRootLayer)
+{
+    WebKit::WebCompositor::initialize(0);
+    RefPtr<LayerChromium> root = LayerChromium::create();
+    RefPtr<LayerChromium> child = LayerChromium::create();
+    root->addChild(child);
+    OwnPtr<FakeCCLayerTreeHost> layerTreeHost(FakeCCLayerTreeHost::create());
+    layerTreeHost->setRootLayer(root);
+    layerTreeHost.clear();
+    WebKit::WebCompositor::shutdown();
+}
+
+class MockLayerChromium : public LayerChromium {
+public:
+    bool needsDisplay() const { return m_needsDisplay; }
+};
+
+TEST(LayerChromiumTestWithoutFixture, setBoundsTriggersSetNeedsRedrawAfterGettingNonEmptyBounds)
+{
+    RefPtr<MockLayerChromium> layer(adoptRef(new MockLayerChromium));
+    EXPECT_FALSE(layer->needsDisplay());
+    layer->setBounds(IntSize(0, 10));
+    EXPECT_FALSE(layer->needsDisplay());
+    layer->setBounds(IntSize(10, 10));
+    EXPECT_TRUE(layer->needsDisplay());
+}
+
+
+} // namespace