Add support for entering/exiting HTML fullscreen from OOPIFs.

content/renderer/render_frame_proxy.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_FRAME_PROXY_H_
 #define CONTENT_RENDERER_RENDER_FRAME_PROXY_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
@@ skipping 154 matching lines @@
   void OnDidUpdateSandboxFlags(blink::WebSandboxFlags flags);
   void OnDispatchLoad();
   void OnDidUpdateName(const std::string& name, const std::string& unique_name);
   void OnEnforceStrictMixedContentChecking(bool should_enforce);
   void OnSetFrameOwnerProperties(
       const blink::WebFrameOwnerProperties& properties);
   void OnDidUpdateOrigin(const url::Origin& origin,
                          bool is_potentially_trustworthy_unique_origin);
   void OnSetPageFocus(bool is_focused);
   void OnSetFocusedFrame();
+  void OnWillEnterFullscreen();
 
   // The routing ID by which this RenderFrameProxy is known.
   const int routing_id_;
 
   // The routing ID of the local RenderFrame (if any) which this
   // RenderFrameProxy is meant to replace in the frame tree.
   const int frame_routing_id_;
 
   // Stores the WebRemoteFrame we are associated with.
   blink::WebRemoteFrame* web_frame_;
   scoped_refptr<ChildFrameCompositingHelper> compositing_helper_;
 
   RenderViewImpl* render_view_;
   RenderWidget* render_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameProxy);
 };
 
 }  // namespace
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_PROXY_H_