DevTools: expose last composited frame metadata on RenderWidgetHostViewPort.

content/port/browser/render_widget_host_view_port.h

Index: content/port/browser/render_widget_host_view_port.h
diff --git a/content/port/browser/render_widget_host_view_port.h b/content/port/browser/render_widget_host_view_port.h
index 162a7fb6cd0f7f2e31efcaa1b6ed2cecc62bf66e..431939610a8a0a16f29178db5c0dde147f9e180b 100644
--- a/content/port/browser/render_widget_host_view_port.h
+++ b/content/port/browser/render_widget_host_view_port.h
@@ -241,6 +241,10 @@ class CONTENT_EXPORT RenderWidgetHostViewPort : public RenderWidgetHostView,
       uint32 output_surface_id,
       scoped_ptr<cc::CompositorFrame> frame) = 0;
 
+  // Returns last compositor frame metadata that was passed
+  // in |OnSwapCompositorFrame|.
+  virtual cc::CompositorFrameMetadata GetCompositorFrameMetadata() = 0;
+
   virtual void GetScreenInfo(WebKit::WebScreenInfo* results) = 0;
 
   // The size of the view's backing surface in non-DPI-adjusted pixels.