Enable webkit_compositor_unittests

cc/CCLayerTreeHostImplTest.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 "CCLayerTreeHostImpl.h"
 
 #include "CCAnimationTestCommon.h"
 #include "CCHeadsUpDisplayLayerImpl.h"
@@ skipping 362 matching lines @@
 
     // This point would fall into the non-fast scrollable region except that we've moved the layer down by 25 pixels.
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(40, 10), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollStarted);
     m_hostImpl->scrollBy(IntPoint(), IntSize(0, 1));
     m_hostImpl->scrollEnd();
 
     // This point is still inside the non-fast region.
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(10, 10), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollOnMainThread);
 }
 
+TEST_F(CCLayerTreeHostImplTest, maxScrollPositionChangedByDeviceScaleFactor)
+{
+    setupScrollAndContentsLayers(IntSize(100, 100));
+
+    float deviceScaleFactor = 2;
+    IntSize layoutViewport(25, 25);
+    IntSize deviceViewport(layoutViewport);
+    deviceViewport.scale(deviceScaleFactor);
+    m_hostImpl->setViewportSize(layoutViewport, deviceViewport);
+    m_hostImpl->setDeviceScaleFactor(deviceScaleFactor);
+    EXPECT_EQ(m_hostImpl->rootLayer()->maxScrollPosition(), IntSize(25, 25));
+
+    deviceScaleFactor = 1;
+    m_hostImpl->setViewportSize(layoutViewport, layoutViewport);
+    m_hostImpl->setDeviceScaleFactor(deviceScaleFactor);
+    EXPECT_EQ(m_hostImpl->rootLayer()->maxScrollPosition(), IntSize(75, 75));
+}
+
 TEST_F(CCLayerTreeHostImplTest, pinchGesture)
 {
     setupScrollAndContentsLayers(IntSize(100, 100));
     m_hostImpl->setViewportSize(IntSize(50, 50), IntSize(50, 50));
     initializeRendererAndDrawFrame();
 
     CCLayerImpl* scrollLayer = m_hostImpl->rootScrollLayer();
     ASSERT(scrollLayer);
 
     const float minPageScale = 0.5, maxPageScale = 4;
@@ skipping 3716 matching lines @@
     while (removeRenderPassesCases[testCaseIndex].name) {
         RenderPassRemovalTestData testData;
         configureRenderPassTestData(removeRenderPassesCases[testCaseIndex].initScript, testData, renderer.get());
         CCLayerTreeHostImpl::removeRenderPasses(CCLayerTreeHostImpl::CullRenderPassesWithCachedTextures(*renderer), testData);
         verifyRenderPassTestData(removeRenderPassesCases[testCaseIndex], testData);
         testCaseIndex++;
     }
 }
 
 } // namespace