Bubble scroll events from WebView guest to embedder.

content/renderer/browser_plugin/browser_plugin.h

Index: content/renderer/browser_plugin/browser_plugin.h
diff --git a/content/renderer/browser_plugin/browser_plugin.h b/content/renderer/browser_plugin/browser_plugin.h
index 730b92149ec17f4252bf45784196552dae2012d7..ef20387258135380c67ee2b112d2deb7428d4d14 100644
--- a/content/renderer/browser_plugin/browser_plugin.h
+++ b/content/renderer/browser_plugin/browser_plugin.h
@@ -158,6 +158,8 @@ class CONTENT_EXPORT BrowserPlugin :
 
   gfx::Rect view_rect() const { return view_rect_; }
 
+  void ScrollEventCompleted(bool scroll_event_handled_by_guest);
+
   void ShowSadGraphic();
   void UpdateInternalInstanceId();