[not for review] Add Draw entries to window Performance Timeline

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index ab897a8ac9914ab08085ab45aa8b1ea8fa4ababf..124d6a2de3bf5798cda1d67adf6adb8ef0398e1d 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -7,6 +7,8 @@
 
 #include <set>
 #include <string>
+#include <utility>
+#include <vector>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
@@ -73,6 +75,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   typedef RenderSurfaceLayerList RenderSurfaceListType;
   typedef LayerList LayerListType;
   typedef RenderSurface RenderSurfaceType;
+  typedef std::vector<std::pair<int64_t, gfx::Rect> > DrawFrameRequestRectsType;
 
   enum LayerIdLabels {
     INVALID_ID = -1,
@@ -296,6 +299,11 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
     return touch_event_handler_region_;
   }
 
+  void SetDrawFrameRequestRects(const DrawFrameRequestRectsType& rects);
+  const DrawFrameRequestRectsType& draw_frame_request_rects() const {
+    return draw_frame_request_rects_;
+  }
+
   void set_did_scroll_callback(const base::Closure& callback) {
     did_scroll_callback_ = callback;
   }
@@ -598,6 +606,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   bool transform_is_invertible_ : 1;
   Region non_fast_scrollable_region_;
   Region touch_event_handler_region_;
+  DrawFrameRequestRectsType draw_frame_request_rects_;
   gfx::PointF position_;
   SkColor background_color_;
   float opacity_;