Make load events in iframe elements work with OOPIF (Blink side).

public/web/WebFrameClient.h

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 294 matching lines @@
     // non-navigational events related to the data held by WebHistoryItem.
     // WARNING: This method may be called very frequently.
     virtual void didUpdateCurrentHistoryItem(WebLocalFrame*) { }
 
     // The frame's manifest has changed.
     virtual void didChangeManifest(WebLocalFrame*) { }
 
     // The frame's theme color has changed.
     virtual void didChangeThemeColor() { }
 
+    // Called to dispatch a load event for this frame in the FrameOwner of an
+    // out-of-process parent frame.
+    virtual void dispatchLoad() { }
+
 
     // Transition navigations -----------------------------------------------
 
     // Provides serialized markup of transition elements for use in the following navigation.
     virtual void addNavigationTransitionData(const WebTransitionElementData&) { }
 
     // Web Notifications ---------------------------------------------------
 
     // Requests permission to display platform notifications on the origin of this frame.
     virtual void requestNotificationPermission(const WebSecurityOrigin&, WebNotificationPermissionCallback* callback) { }
@@ skipping 297 matching lines @@
     };
     virtual void suddenTerminationDisablerChanged(bool present, SuddenTerminationDisablerType) { }
 
 protected:
     virtual ~WebFrameClient() { }
 };
 
 } // namespace blink
 
 #endif