DevTools: expose last composited frame metadata on RenderWidgetHostViewPort.

content/browser/renderer_host/render_widget_host_view_base.h

Index: content/browser/renderer_host/render_widget_host_view_base.h
diff --git a/content/browser/renderer_host/render_widget_host_view_base.h b/content/browser/renderer_host/render_widget_host_view_base.h
index ab8f8cb8be807d46aed70b2accb6eb6c6df21116..c71ef6a9538bb742496fae570c1bded1ebe011bf 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -79,6 +79,8 @@ class CONTENT_EXPORT RenderWidgetHostViewBase
   virtual void OnSwapCompositorFrame(
       uint32 output_surface_id,
       scoped_ptr<cc::CompositorFrame> frame) OVERRIDE {}
+  virtual cc::CompositorFrameMetadata GetCompositorFrameMetadata() OVERRIDE;
+
   virtual void OnOverscrolled(gfx::Vector2dF accumulated_overscroll,
                               gfx::Vector2dF current_fling_velocity) OVERRIDE;
   virtual uint32 RendererFrameNumber() OVERRIDE;
@@ -147,6 +149,10 @@ class CONTENT_EXPORT RenderWidgetHostViewBase
   ui::Range selection_range_;
 
 protected:
+  // Updates current compositor frame metadata.
+  virtual void UpdateCompositorFrameMetadata(
+      const cc::CompositorFrameMetadata& frame_metadata);
+
   // The scale factor of the display the renderer is currently on.
   float current_device_scale_factor_;
 
@@ -158,6 +164,8 @@ protected:
 
   uint32 renderer_frame_number_;
 
+  cc::CompositorFrameMetadata compositor_frame_metadata_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewBase);
 };