Timeline: do not rely on UpdateLayer & PaintLayer trace events

Source/core/rendering/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 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 1731 matching lines @@
     context.restore();
 }
 
 // Up-call from compositing layer drawing callback.
 void CompositedLayerMapping::paintContents(const GraphicsLayer* graphicsLayer, GraphicsContext& context, GraphicsLayerPaintingPhase paintingPhase, const IntRect& clip)
 {
 #ifndef NDEBUG
     if (Page* page = renderer()->frame()->page())
         page->setIsPainting(true);
 #endif
-    InspectorInstrumentation::willPaint(m_owningLayer->renderer());
+    InspectorInstrumentation::willPaint(m_owningLayer->renderer(), graphicsLayer);
 
     if (graphicsLayer == m_graphicsLayer.get()
         || graphicsLayer == m_foregroundLayer.get()
         || graphicsLayer == m_backgroundLayer.get()
         || graphicsLayer == m_maskLayer.get()
         || graphicsLayer == m_childClippingMaskLayer.get()
         || graphicsLayer == m_scrollingContentsLayer.get()) {
 
         GraphicsLayerPaintInfo paintInfo;
         paintInfo.renderLayer = m_owningLayer;
@@ skipping 268 matching lines @@
     } else if (graphicsLayer == m_scrollingContentsLayer.get()) {
         name = "Scrolling Contents Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore