[Invalidation Tracking] Add trace events for compositor based invalidations

Source/core/rendering/compositing/CompositingLayerAssigner.h

 /*
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  * Copyright (C) 2014 Google Inc. All rights reserved.
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 #ifndef CompositingLayerAssigner_h
 #define CompositingLayerAssigner_h
 
+#include "core/rendering/compositing/GraphicsLayerUpdater.h"
 #include "core/rendering/compositing/RenderLayerCompositor.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutPoint.h"
 
 namespace blink {
 
 class RenderLayer;
 
 class CompositingLayerAssigner {
 public:
     explicit CompositingLayerAssigner(RenderLayerCompositor*);
     ~CompositingLayerAssigner();
 
-    void assign(RenderLayer* updateRoot, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
+    void assign(RenderLayer* updateRoot, LayersNeedingPaintInvalidation&);
 
     bool layersChanged() const { return m_layersChanged; }
 
     // FIXME: This function should be private. We should remove the one caller
     // once we've fixed the compositing chicken/egg issues.
     CompositingStateTransitionType computeCompositedLayerUpdate(RenderLayer*);
 
 private:
     struct SquashingState {
         SquashingState()
@@ skipping 18 matching lines @@
         size_t nextSquashedLayerIndex;
 
         // The absolute bounding rect of all the squashed layers.
         IntRect boundingRect;
 
         // This is simply the sum of the areas of the squashed rects. This can be very skewed if the rects overlap,
         // but should be close enough to drive a heuristic.
         uint64_t totalAreaOfSquashedRects;
     };
 
-    void assignLayersToBackingsInternal(RenderLayer*, SquashingState&, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
-    void assignLayersToBackingsForReflectionLayer(RenderLayer* reflectionLayer, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
+    void assignLayersToBackingsInternal(RenderLayer*, SquashingState&, LayersNeedingPaintInvalidation&);
+    void assignLayersToBackingsForReflectionLayer(RenderLayer* reflectionLayer, LayersNeedingPaintInvalidation&);
     CompositingReasons getReasonsPreventingSquashing(const RenderLayer*, const SquashingState&);
     bool squashingWouldExceedSparsityTolerance(const RenderLayer* candidate, const SquashingState&);
-    void updateSquashingAssignment(RenderLayer*, SquashingState&, CompositingStateTransitionType, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
+    void updateSquashingAssignment(RenderLayer*, SquashingState&, CompositingStateTransitionType, LayersNeedingPaintInvalidation&);
     bool needsOwnBacking(const RenderLayer*) const;
 
     RenderLayerCompositor* m_compositor;
     bool m_layerSquashingEnabled;
     bool m_layersChanged;
 };
 
 } // namespace blink
 
 #endif // CompositingLayerAssigner_h