Timeline: do not rely on UpdateLayer & PaintLayer trace events

Source/core/inspector/InspectorInstrumentation.idl

 /*
 * Copyright (C) 2013 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
@@ skipping 218 matching lines @@
     [Timeline, Inline=FastReturn]
     void didDispatchXHRLoadEvent(const InspectorInstrumentationCookie&);
 
     [Timeline, Inline=FastReturn]
     void willScrollLayer([Keep] RenderObject*);
 
     [Timeline, Inline=FastReturn]
     void didScrollLayer(RenderObject*);
 
     [Timeline, Inline=FastReturn]
-    void willPaint([Keep] RenderObject*);
+    void willPaint([Keep] RenderObject*, const GraphicsLayer*);
 
     [Timeline, Page, LayerTree, Inline=FastReturn]
     void didPaint([Keep] RenderObject*, const GraphicsLayer*, GraphicsContext*, const LayoutRect&);
 
     [Timeline, Inline=FastReturn]
     void willPaintImage([Keep] RenderImage*);
 
     [Timeline, Inline=FastReturn]
     void didPaintImage(RenderImage*);
 
@@ skipping 276 matching lines @@
 interface InspectorCanvasInstrumentation {
 
 #include "bindings/v8/ScriptObject.h"
 
     [Canvas]
     ScriptObject wrapCanvas2DRenderingContextForInstrumentation(Document*, const ScriptObject&);
 
     [Canvas]
     ScriptObject wrapWebGLRenderingContextForInstrumentation(Document*, const ScriptObject&);
 }