Plumb an overscroll callback form the compositor to the Android UI thread.

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index 823208aeb89e5f9608b8873005a8cd3933cf6c8c..82104eaae5bb86e3fb9b7af943e367327a188836 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -32,6 +32,7 @@
 class WebCursor;
 struct AcceleratedSurfaceMsg_BufferPresented_Params;
 struct ViewHostMsg_UpdateRect_Params;
+struct ViewHostMsg_UpdateFrameInfo_Params;
 struct ViewHostMsg_TextInputState_Params;
 struct ViewHostMsg_BeginSmoothScroll_Params;
 
@@ -603,11 +604,7 @@ class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
                                           uint64 surface_handle);
 #endif
 #if defined(OS_ANDROID)
-  void OnUpdateFrameInfo(const gfx::Vector2d& scroll_offset,
-                         float page_scale_factor,
-                         float min_page_scale_factor,
-                         float max_page_scale_factor,
-                         const gfx::Size& content_size);
+  void OnUpdateFrameInfo(const ViewHostMsg_UpdateFrameInfo_Params& params);
 #endif
 #if defined(TOOLKIT_GTK)
   void OnCreatePluginContainer(gfx::PluginWindowHandle id);