Re-land of issue 200623006: Set geometry dirty bits on composited layer mappings w/squashing

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 158 matching lines @@
 
     createPrimaryGraphicsLayer();
 }
 
 CompositedLayerMapping::~CompositedLayerMapping()
 {
     // Do not leave the destroyed pointer dangling on any RenderLayers that painted to this mapping's squashing layer.
     for (size_t i = 0; i < m_squashedLayers.size(); ++i) {
         RenderLayer* oldSquashedLayer = m_squashedLayers[i].renderLayer;
         if (oldSquashedLayer->groupedMapping() == this) {
-            oldSquashedLayer->setGroupedMapping(0);
+            oldSquashedLayer->setGroupedMapping(0, true);
             oldSquashedLayer->setLostGroupedMapping(true);
         }
     }
 
     updateClippingLayers(false, false);
     updateOverflowControlsLayers(false, false, false);
     updateChildTransformLayer(false);
     updateForegroundLayer(false);
     updateBackgroundLayer(false);
     updateMaskLayer(false);
@@ skipping 1942 matching lines @@
     } else if (graphicsLayer == m_scrollingContentsLayer.get()) {
         name = "Scrolling Contents Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore