Enable swapping a frame back in to its parent process

content/browser/frame_host/render_frame_proxy_host.cc

 // 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.
 
 #include "content/browser/frame_host/render_frame_proxy_host.h"
 
 #include "base/lazy_instance.h"
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/frame_tree_node.h"
@@ skipping 136 matching lines @@
                                       ->GetRenderViewHost(site_instance_.get())
                                       ->GetRoutingID()));
 
   return true;
 }
 
 void RenderFrameProxyHost::DisownOpener() {
   Send(new FrameMsg_DisownOpener(GetRoutingID()));
 }
 
+void RenderFrameProxyHost::SwapOut(RenderFrameHostImpl* host) {
+  Send(new FrameMsg_SwapOut(GetRoutingID(), host->GetRoutingID()));

[Nate Chapin, 2014/09/30 21:44:48]

I was lazy and just reused the existing FrameMsg_SwapOut IPC here, where a proxy
is being swapped out in favor of a real frame. Is this ok, or should it use a
new FrameMsg_SwapIn to make it clear what is being swapped?

+}
+
 void RenderFrameProxyHost::OnOpenURL(
     const FrameHostMsg_OpenURL_Params& params) {
   frame_tree_node_->current_frame_host()->OpenURL(params);
 }
 
 }  // namespace content