Disable solid background color optimization for composited layers.

Source/core/platform/graphics/chromium/GraphicsLayerChromium.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 494 matching lines @@
         // The old contents layer will be removed via updateChildList.
         m_contentsLayer = 0;
     }
 
     if (childrenChanged)
         updateChildList();
 }
 
 void GraphicsLayerChromium::setContentsToSolidColor(const Color& color)
 {
-    if (color == m_contentsSolidColor)
-        return;
-
-    bool childrenChanged = false;
-
-    m_contentsSolidColor = color;
-
-    if (color.isValid() && color.alpha()) {
-        if (!m_contentsSolidColorLayer) {
-            m_contentsSolidColorLayer = adoptPtr(Platform::current()->compositorSupport()->createSolidColorLayer());
-            registerContentsLayer(m_contentsSolidColorLayer->layer());
-
-            setupContentsLayer(m_contentsSolidColorLayer->layer());
-            childrenChanged = true;
-        }
-
-        m_contentsSolidColorLayer->setBackgroundColor(color.rgb());
-        updateContentsRect();
-    } else {
-        if (m_contentsSolidColorLayer) {
-            childrenChanged = true;
-            unregisterContentsLayer(m_contentsSolidColorLayer->layer());
-            m_contentsSolidColorLayer.clear();
-        }
-        m_contentsLayer = 0;
-    }
-
-    if (childrenChanged)
-        updateChildList();
-
 }
 
 static HashSet<int>* s_registeredLayerSet;
 
 void GraphicsLayerChromium::registerContentsLayer(WebLayer* layer)
 {
     if (!s_registeredLayerSet)
         s_registeredLayerSet = new HashSet<int>;
     if (s_registeredLayerSet->contains(layer->id()))
         CRASH();
@@ skipping 347 matching lines @@
     info.addMember(m_transformLayer, "transformLayer");
     info.addMember(m_imageLayer, "imageLayer");
     info.addMember(m_contentsLayer, "contentsLayer");
     info.addMember(m_linkHighlight, "linkHighlight");
     info.addMember(m_opaqueRectTrackingContentLayerDelegate, "opaqueRectTrackingContentLayerDelegate");
     info.addMember(m_animationIdMap, "animationIdMap");
     info.addMember(m_scrollableArea, "scrollableArea");
 }
 
 } // namespace WebCore