Disallow squashing for layers with reflections

Source/core/rendering/compositing/CompositingLayerAssigner.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google 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
@@ skipping 116 matching lines @@
     // video to share a backing with other layers.
     //
     // compositing/video/video-controls-layer-creation.html
     // virtual/softwarecompositing/video/video-controls-layer-creation.html
     if (layer->renderer()->isVideo())
         return CompositingReasonSquashingVideoIsDisallowed;
 
     // Don't squash iframes, frames or plugins.
     // FIXME: this is only necessary because there is frame code that assumes that composited frames are not squashed.
     if (layer->renderer()->isRenderPart())
-        return CompositedReasonSquashingRenderPart;
+        return CompositingReasonSquashingRenderPartIsDisallowed;
+
+    if (layer->reflectionInfo())
+        return CompositingReasonSquashingReflectionIsDisallowed;
 
     if (squashingWouldExceedSparsityTolerance(layer, squashingState))
         return CompositingReasonSquashingSparsityExceeded;
 
     // FIXME: this is not efficient, since it walks up the tree . We should store these values on the CompositingInputsCache.
     ASSERT(squashingState.hasMostRecentMapping);
     const RenderLayer& squashingLayer = squashingState.mostRecentMapping->owningLayer();
 
     if (layer->compositingInputs().clippingContainer != squashingLayer.compositingInputs().clippingContainer) {
         if (!squashingLayer.compositedLayerMapping()->containingSquashedLayer(layer->compositingInputs().clippingContainer))
@@ skipping 128 matching lines @@
 
     RenderLayerStackingNodeIterator iterator(*layer->stackingNode(), NormalFlowChildren | PositiveZOrderChildren);
     while (RenderLayerStackingNode* curNode = iterator.next())
         assignLayersToBackingsInternal(curNode->layer(), squashingState, layersNeedingRepaint);
 
     if (squashingState.hasMostRecentMapping && &squashingState.mostRecentMapping->owningLayer() == layer)
         squashingState.haveAssignedBackingsToEntireSquashingLayerSubtree = true;
 }
 
 }