Make <webview> use out-of-process iframe architecture.

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 735 matching lines @@
       command_line.HasSwitch(switches::kAllowInsecureWebSocketFromHttpsOrigin));
 
   RenderFrameProxy* proxy = NULL;
   if (params.proxy_routing_id != MSG_ROUTING_NONE) {
     CHECK(params.swapped_out);
     proxy = RenderFrameProxy::CreateProxyToReplaceFrame(
         main_render_frame_.get(), params.proxy_routing_id);
     main_render_frame_->set_render_frame_proxy(proxy);
   }
 
+  // This breaks postMessage otherwise.
+  webview()->setMainFrame(main_render_frame_->GetWebFrame());

[Fady Samuel, 2015/03/04 22:21:06]

What does this do?

+  /*
   // In --site-per-process, just use the WebRemoteFrame as the main frame.
   if (command_line.HasSwitch(switches::kSitePerProcess) && proxy) {
     webview()->setMainFrame(proxy->web_frame());
     // Initialize the WebRemoteFrame with information replicated from the
     // browser process.
     proxy->SetReplicatedState(params.replicated_frame_state);
   } else {
     webview()->setMainFrame(main_render_frame_->GetWebFrame());
   }
+  */
   main_render_frame_->Initialize();
 
   if (switches::IsTouchDragDropEnabled())
     webview()->settings()->setTouchDragDropEnabled(true);
 
   if (switches::IsTouchEditingEnabled())
     webview()->settings()->setTouchEditingEnabled(true);
 
   if (!params.frame_name.empty())
     webview()->mainFrame()->setName(params.frame_name);
@@ skipping 3282 matching lines @@
     std::vector<gfx::Size> sizes;
     ConvertToFaviconSizes(icon_urls[i].sizes(), &sizes);
     if (!url.isEmpty())
       urls.push_back(
           FaviconURL(url, ToFaviconType(icon_urls[i].iconType()), sizes));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content