webkit/ppapi: Notify the container when a plugin is accepting wheel events just like r143871.

webkit/plugins/ppapi/ppapi_plugin_instance.h

Index: webkit/plugins/ppapi/ppapi_plugin_instance.h
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.h b/webkit/plugins/ppapi/ppapi_plugin_instance.h
index 0a8949ecf4afc5b51a19f8ee2be1ae86c2bf6458..af07f75aafa6ac43e83528da36dbeb3569320aaa 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.h
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.h
@@ -500,6 +500,8 @@ class WEBKIT_PLUGINS_EXPORT PluginInstance :
 
   // Returns true if the plugin has registered to accept touch events.
   bool IsAcceptingTouchEvents() const;
+  // Returns true if the plugin has registered to accept wheel events.
+  bool IsAcceptingWheelEvents() const;
 
   void ScheduleAsyncDidChangeView();
   void SendAsyncDidChangeView();
@@ -547,6 +549,9 @@ class WEBKIT_PLUGINS_EXPORT PluginInstance :
       int selection_start,
       int selection_end);
 
+  // Internal helper function for XXXInputEvents().
+  void RequestInputEventsHelper(uint32_t event_classes);
+
   // Checks if the security origin of the document containing this instance can
   // assess the security origin of the main frame document.
   bool CanAccessMainFrame() const;