Delete chicken/egg compositing geometry updates

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 412 matching lines @@
 
 void CompositedLayerMapping::updateCompositingReasons()
 {
     // All other layers owned by this mapping will have the same compositing reason
     // for their lifetime, so they are initialized only when created.
     m_graphicsLayer->setCompositingReasons(m_owningLayer.compositingReasons());
 }
 
 void CompositedLayerMapping::updateAfterLayout(bool needsFullRepaint, bool isUpdateRoot)
 {
-    RenderLayerCompositor* layerCompositor = compositor();
-    if (!layerCompositor->compositingLayersNeedRebuild()) {
-        // Calling updateGraphicsLayerGeometry() here gives incorrect results, because the
-        // position of this layer's GraphicsLayer depends on the position of our compositing
-        // ancestor's GraphicsLayer. That cannot be determined until all the descendant
-        // RenderLayers of that ancestor have been processed via updateLayerPositions().
-        //
-        // The solution is to update compositing children of this layer here,
-        // via updateCompositingChildrenGeometry().
-        updateCompositedBounds(GraphicsLayerUpdater::ForceUpdate);
-        layerCompositor->updateCompositingDescendantGeometry(m_owningLayer.stackingNode(), &m_owningLayer);
-
-        if (isUpdateRoot) {
-            updateGraphicsLayerGeometry(GraphicsLayerUpdater::ForceUpdate);
-            layerCompositor->updateRootLayerPosition();
-            RenderLayerStackingNode* stackingContainer = m_owningLayer.stackingNode()->enclosingStackingContainerNode();
-            if (!layerCompositor->compositingLayersNeedRebuild() && stackingContainer && (stackingContainer != m_owningLayer.stackingNode()))
-                layerCompositor->updateCompositingDescendantGeometry(stackingContainer, stackingContainer->layer());
-        }
-    }
-
     if (needsFullRepaint && !paintsIntoCompositedAncestor())
         setContentsNeedDisplay();
 }
 
 bool CompositedLayerMapping::updateGraphicsLayerConfiguration(GraphicsLayerUpdater::UpdateType updateType)
 {
     if (!shouldUpdateGraphicsLayer(updateType))
         return false;
 
     RenderLayerCompositor* compositor = this->compositor();
@@ skipping 1715 matching lines @@
     } else if (graphicsLayer == m_scrollingContentsLayer.get()) {
         name = "Scrolling Contents Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore