WIP: Propagate SurfaceID up window tree hierarchy

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 48f7d669b3bac82fce33b478c03649bd707ca564..3eaf34c09b709da11d07bf9f8cc6ac514d753bd1 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -228,16 +228,17 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
 
   // Returns the compositing surface ID namespace, or 0 if Surfaces are not
   // enabled.
-  virtual uint32_t GetSurfaceClientId();
+  virtual cc::FrameSinkId GetFrameSinkId();
 
   // When there are multiple RenderWidgetHostViews for a single page, input
   // events need to be targeted to the correct one for handling. The following
   // methods are invoked on the RenderWidgetHostView that should be able to
   // properly handle the event (i.e. it has focus for keyboard events, or has
   // been identified by hit testing mouse, touch or gesture events).
-  virtual uint32_t SurfaceClientIdAtPoint(cc::SurfaceHittestDelegate* delegate,
-                                          const gfx::Point& point,
-                                          gfx::Point* transformed_point);
+  virtual cc::FrameSinkId FrameSinkIdAtPoint(
+      cc::SurfaceHittestDelegate* delegate,
+      const gfx::Point& point,
+      gfx::Point* transformed_point);
   virtual void ProcessKeyboardEvent(const NativeWebKeyboardEvent& event) {}
   virtual void ProcessMouseEvent(const blink::WebMouseEvent& event,
                                  const ui::LatencyInfo& latency) {}