OOPIFs: Transitioning MHTML generation from view-oriented to frame-oriented.

content/renderer/web_frame_utils.h

 // Copyright 2015 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_WEB_FRAME_UTILS_H_
 #define CONTENT_RENDERER_WEB_FRAME_UTILS_H_
 
 namespace blink {
 class WebFrame;
 }
 
 namespace content {
 
 // Returns the routing ID of the RenderFrameImpl or RenderFrameProxy
 // associated with |web_frame|.
 int GetRoutingIdForFrameOrProxy(blink::WebFrame* web_frame);
 
+// Returns either a WebLocalFrame or WebRemoteFrame based on |routing_id|.
+// Returns nullptr if |routing_id| doesn't properly map to a frame.
+blink::WebFrame* GetWebFrameFromRoutingIdForFrameOrProxy(int routing_id);
+
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_WEB_FRAME_UTILS_H_