[Invalidation Tracking] Add trace events for compositor based invalidations

Source/core/rendering/compositing/GraphicsLayerUpdater.h

 /*
  * 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 15 matching lines @@
 
 #ifndef GraphicsLayerUpdater_h
 #define GraphicsLayerUpdater_h
 
 #include "platform/graphics/GraphicsLayer.h"
 
 namespace blink {
 
 class RenderLayer;
 
+typedef Vector<std::pair<RenderLayer*, const char*> > LayersNeedingPaintInvalidation;
+
 class GraphicsLayerUpdater {
 
 public:
     GraphicsLayerUpdater();
     ~GraphicsLayerUpdater();
 
     enum UpdateType {
         DoNotForceUpdate,
         ForceUpdate,
     };
 
-    void update(RenderLayer&, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
+    void update(RenderLayer&, LayersNeedingPaintInvalidation&);
 
     bool needsRebuildTree() const { return m_needsRebuildTree; }
 
 #if ENABLE(ASSERT)
     static void assertNeedsToUpdateGraphicsLayerBitsCleared(RenderLayer&);
 #endif
 
 private:
     class UpdateContext;
 
-    void updateRecursive(RenderLayer&, UpdateType, const UpdateContext&, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
+    void updateRecursive(RenderLayer&, UpdateType, const UpdateContext&, LayersNeedingPaintInvalidation&);
 
     bool m_needsRebuildTree;
 };
 
 } // namespace blink
 
 #endif // GraphicsLayerUpdater_h