Retry r27137. Create renderers for ExtensionHosts one at a time to avoid blocking the UI.

chrome/browser/renderer_host/browser_render_process_host.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_H_
 
 #include "build/build_config.h"
 
 #include <map>
@@ skipping 148 matching lines @@
 
   // Used in single-process mode.
   scoped_ptr<RendererMainThread> in_process_renderer_;
 
   // Buffer visited links and send them to to renderer.
   scoped_ptr<VisitedLinkUpdater> visited_link_updater_;
 
   // True iff the renderer is a child of a zygote process.
   bool zygote_child_;
 
+  // True if FastShutdownIfPossible was called and was successful.
+  bool fast_shutdown_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserRenderProcessHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_H_