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 713 matching lines @@
   webview()->settings()->setPreferCompositingToLCDTextEnabled(
       PreferCompositingToLCDText(compositor_deps_, device_scale_factor_));
   webview()->settings()->setThreadedScrollingEnabled(
       !command_line.HasSwitch(switches::kDisableThreadedScrolling));
   webview()->settings()->setRootLayerScrolls(
       command_line.HasSwitch(switches::kRootLayerScrolls));
 
   ApplyWebPreferences(webkit_preferences_, webview());
 
   RenderFrameProxy* proxy = NULL;
-  if (params.proxy_routing_id != MSG_ROUTING_NONE) {
+  // Do not create a proxy here if this is a swapped out RenderView for an
+  // inner WebContents.
+  // The proxy will be created in RenderFrameImpl::OnSwapOut().

[nasko, 2015/05/22 16:32:28]

Is it not possible to just pass MSG_ROUTING_NONE from the browser process in
this case? Then it will make this code independent of the boolean.

[lazyboy, 2015/05/26 16:32:55]

Yes, done.

+  if (params.proxy_routing_id != MSG_ROUTING_NONE &&
+      !params.is_inner_web_contents_in_site_per_process) {
     CHECK(params.swapped_out);
     proxy = RenderFrameProxy::CreateProxyToReplaceFrame(
         main_render_frame_, params.proxy_routing_id);
     main_render_frame_->set_render_frame_proxy(proxy);
   }
 
   // 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
@@ skipping 3016 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