Plumb CompositingReason from Blink to compositor.

Source/core/rendering/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 1553 matching lines @@
     if (requiresCompositingForFrame(renderer))
         directReasons |= CompositingReasonIFrame;
     
     if (requiresCompositingForBackfaceVisibilityHidden(renderer))
         directReasons |= CompositingReasonBackfaceVisibilityHidden;
 
     if (requiresCompositingForAnimation(renderer))
         directReasons |= CompositingReasonAnimation;
 
     if (requiresCompositingForTransition(renderer))
-        directReasons |= CompositingReasonTransition;
+        directReasons |= CompositingReasonAnimation;
 
     if (requiresCompositingForFilters(renderer))
         directReasons |= CompositingReasonFilters;
 
     if (requiresCompositingForPosition(renderer, layer))
         directReasons |= renderer->style()->position() == FixedPosition ? CompositingReasonPositionFixed : CompositingReasonPositionSticky;
 
     if (requiresCompositingForOverflowScrolling(layer))
         directReasons |= CompositingReasonOverflowScrollingTouch;
 
@@ skipping 35 matching lines @@
     
     if (reasons & CompositingReasonBackfaceVisibilityHidden)
         return "backface-visibility: hidden";
 
     if (reasons & CompositingReasonClipsCompositingDescendants)
         return "clips compositing descendants";
 
     if (reasons & CompositingReasonAnimation)
         return "animation";
 
-    if (reasons & CompositingReasonTransition)
-        return "transition";
-
     if (reasons & CompositingReasonFilters)
         return "filters";
 
     if (reasons & CompositingReasonPositionFixed)
         return "position: fixed";
 
     if (reasons & CompositingReasonPositionSticky)
         return "position: sticky";
 
     if (reasons & CompositingReasonOverflowScrollingTouch)
@@ skipping 1101 matching lines @@
     info.addMember(m_layerForScrollCorner, "layerForScrollCorner");
 #if ENABLE(RUBBER_BANDING)
     info.addMember(m_layerForOverhangAreas, "layerForOverhangAreas");
     info.addMember(m_contentShadowLayer, "contentShadowLayer");
     info.addMember(m_layerForTopOverhangArea, "layerForTopOverhangArea");
     info.addMember(m_layerForBottomOverhangArea, "layerForBottomOverhangArea");
 #endif
 }
 
 } // namespace WebCore