update3dRenderingContext is 13.5% of GraphicsLayerUpdater::rebuildTree

Source/core/rendering/compositing/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1255 matching lines @@
 
 struct UpdateShouldFlattenTransformFunctor {
     void operator() (GraphicsLayer* layer) const { layer->setShouldFlattenTransform(shouldFlatten); }
     bool shouldFlatten;
 };
 
 void CompositedLayerMapping::updateShouldFlattenTransform()
 {
     // All CLM-managed layers that could affect a descendant layer should update their
     // should-flatten-transform value (the other layers' transforms don't matter here).
-    UpdateShouldFlattenTransformFunctor functor = { m_owningLayer.shouldFlattenTransform() };
+    UpdateShouldFlattenTransformFunctor functor = { !m_owningLayer.shouldPreserve3D() };
     ApplyToGraphicsLayersMode mode = ApplyToCoreLayers;
     ApplyToGraphicsLayers(this, functor, mode);
 }
 
 bool CompositedLayerMapping::updateForegroundLayer(bool needsForegroundLayer)
 {
     bool layerChanged = false;
     if (needsForegroundLayer) {
         if (!m_foregroundLayer) {
             m_foregroundLayer = createGraphicsLayer(CompositingReasonLayerForForeground);
@@ skipping 876 matching lines @@
     } else if (graphicsLayer == m_scrollingContentsLayer.get()) {
         name = "Scrolling Contents Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore