Don't reuse a GpuProcessHost that failed to send a message

content/browser/gpu/gpu_process_host.h

 // 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.
 
 #ifndef CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_H_
 
 #include <map>
 #include <queue>
 #include <string>
@@ skipping 153 matching lines @@
   // Multimap is used to simulate reference counting, see comment in
   // GpuProcessHostUIShim::CreateViewCommandBuffer.
   class SurfaceRef;
   typedef std::multimap<int, linked_ptr<SurfaceRef> > SurfaceRefMap;
   SurfaceRefMap surface_refs_;
 #endif
 
   // Qeueud messages to send when the process launches.
   std::queue<IPC::Message*> queued_messages_;
 
+  // Whether the GPU process is valid, set to false after Send() failed.
+  bool valid_;
+
   // Whether we are running a GPU thread inside the browser process instead
   // of a separate GPU process.
   bool in_process_;
 
   bool software_rendering_;
   GpuProcessKind kind_;
 
   scoped_ptr<GpuMainThread> in_process_gpu_thread_;
 
   // Whether we actually launched a GPU process.
   bool process_launched_;
 
   // Time Init started.  Used to log total GPU process startup time to UMA.
   base::TimeTicks init_start_time_;
 
   // Master switch for enabling/disabling GPU acceleration for the current
   // browser session. It does not change the acceleration settings for
   // existing tabs, just the future ones.
   static bool gpu_enabled_;
 
   static bool hardware_gpu_enabled_;
 
   scoped_ptr<BrowserChildProcessHostImpl> process_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);
 };
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_H_