Adds support for hittesting points on surface quads

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 75baf81a43417a9ce616a9bee71b1cdc7b39b9a8..5b3070da26997d5d972ab4b78e4fd13280015272 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -178,6 +178,14 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   // enabled.
   virtual uint32_t GetSurfaceIdNamespace();
 
+  // 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 SurfaceIdNamespaceAtPoint(const gfx::Point& point,
+                                             gfx::Point* transformed_point);
+
   //----------------------------------------------------------------------------
   // The following static methods are implemented by each platform.