Support window.opener after a process swap.

content/renderer/render_view_observer.h

 // Copyright (c) 2011 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_VIEW_OBSERVER_H_
 #define CONTENT_RENDERER_RENDER_VIEW_OBSERVER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "ipc/ipc_channel.h"
@@ skipping 14 matching lines @@
 
 // Base class for objects that want to filter incoming IPCs, and also get
 // notified of changes to the frame.
 class RenderViewObserver : public IPC::Channel::Listener,
                            public IPC::Message::Sender {
  public:
   // By default, observers will be deleted when the RenderView goes away.  If
   // they want to outlive it, they can override this function.
   virtual void OnDestruct();
 
+  // Allows certain IPC messages to be sent while swapped out, in case they
+  // are needed to keep the browser and renderer in a consistent state.
+  virtual bool CanSendWhileSwappedOut(IPC::Message* message) { return false; }
+
   // These match the WebKit API notifications
   virtual void DidStartLoading() {}
   virtual void DidStopLoading() {}
   virtual void DidChangeIcons(WebKit::WebFrame* frame) {}
   virtual void DidFinishDocumentLoad(WebKit::WebFrame* frame) {}
   virtual void DidFailLoad(WebKit::WebFrame* frame,
                            const WebKit::WebURLError& error) {}
   virtual void DidFinishLoad(WebKit::WebFrame* frame) {}
   virtual void DidStartProvisionalLoad(WebKit::WebFrame* frame) {}
   virtual void DidFailProvisionalLoad(WebKit::WebFrame* frame,
@@ skipping 48 matching lines @@
   void set_render_view(RenderView* rv) { render_view_ = rv; }
 
   RenderView* render_view_;
   // The routing ID of the associated RenderView.
   int routing_id_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewObserver);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_OBSERVER_H_