Only update style-determined composited reasons during the chicken/egg compositing update

Source/core/rendering/compositing/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 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 473 matching lines @@
             // by checking for a parent.
             if (layer->parent())
                 layer->repainter().computeRepaintRectsIncludingNonCompositingDescendants();
             repaintOnCompositingChange(layer);
         }
     }
 }
 
 void RenderLayerCompositor::updateLayerCompositingState(RenderLayer* layer, UpdateLayerCompositingStateOptions options)
 {
-    updateDirectCompositingReasons(layer);
+    layer->setCompositingReasons(layer->styleDeterminedCompositingReasons(), CompositingReasonComboAllStyleDeterminedReasons);
     CompositingStateTransitionType compositedLayerUpdate = CompositingLayerAssigner(this).computeCompositedLayerUpdate(layer);
 
     if (compositedLayerUpdate != NoCompositingStateChange)
         setNeedsCompositingUpdate(CompositingUpdateRebuildTree);
 
     if (options == UseChickenEggHacks)
         applyUpdateLayerCompositingStateChickenEggHacks(layer, compositedLayerUpdate);
 }
 
 void RenderLayerCompositor::repaintOnCompositingChange(RenderLayer* layer)
@@ skipping 745 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "LocalFrame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore