This adds in the ability for Chrome to generate windows with snapshots of all...

chrome/browser/renderer_host/render_widget_helper.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_RENDER_WIDGET_HELPER_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HELPER_H_
 
 #include <map>
 
 #include "app/surface/transport_dib.h"
@@ skipping 170 matching lines @@
   // Called on destruction to release all allocated transport DIBs
   void ClearAllocatedDIBs();
 
   // On OSX we keep file descriptors to all the allocated DIBs around until
   // the renderer frees them.
   Lock allocated_dibs_lock_;
   std::map<TransportDIB::Id, int> allocated_dibs_;
 #endif
 
   // A map of live paint messages.  Must hold pending_paints_lock_ to access.
-  // The PaintMsgProxy objects are not owned by this map.  (See PaintMsgProxy
+  // The UpdateMsgProxy objects are not owned by this map.  (See UpdateMsgProxy
   // for details about how the lifetime of instances are managed.)
   UpdateMsgProxyMap pending_paints_;
   Lock pending_paints_lock_;
 
   int render_process_id_;
 
   // Event used to implement WaitForUpdateMsg.
   base::WaitableEvent event_;
 
   // The next routing id to use.
   base::AtomicSequenceNumber next_routing_id_;
 
   ResourceDispatcherHost* resource_dispatcher_host_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHelper);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HELPER_H_