WIP: Propagate SurfaceID up window tree hierarchy

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index 7950bf414bb86ce8e9aa24abaf7eb1452f219524..354aacc50c5556b19c809063fb04e5a69cf7f27d 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -185,10 +185,10 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   void OnDidNavigateMainFrameToNewPage() override;
   void LockCompositingSurface() override;
   void UnlockCompositingSurface() override;
-  uint32_t GetSurfaceClientId() override;
-  uint32_t SurfaceClientIdAtPoint(cc::SurfaceHittestDelegate* delegate,
-                                  const gfx::Point& point,
-                                  gfx::Point* transformed_point) override;
+  cc::FrameSinkId GetFrameSinkId() override;
+  cc::FrameSinkId FrameSinkIdAtPoint(cc::SurfaceHittestDelegate* delegate,
+                                     const gfx::Point& point,
+                                     gfx::Point* transformed_point) override;
   void ProcessMouseEvent(const blink::WebMouseEvent& event,
                          const ui::LatencyInfo& latency) override;
   void ProcessMouseWheelEvent(const blink::WebMouseWheelEvent& event,