gpu: Do not relaunch the process during teardown.

content/browser/gpu/gpu_process_host.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/browser/gpu/gpu_process_host.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 351 matching lines @@
   DCHECK(gpu_data_manager);
   if (!gpu_data_manager->GpuAccessAllowed(NULL))
     return NULL;
 
   if (g_gpu_process_hosts[kind] && ValidateHost(g_gpu_process_hosts[kind]))
     return g_gpu_process_hosts[kind];
 
   if (!force_create)
     return nullptr;
 
+  // Do not create a new process if browser is shutting down.
+  if (BrowserMainRunner::ExitedMainMessageLoop())
+    return nullptr;
+
   static int last_host_id = 0;
   int host_id;
   host_id = ++last_host_id;
 
   GpuProcessHost* host = new GpuProcessHost(host_id, kind);
   if (host->Init())
     return host;
 
   // TODO(sievers): Revisit this behavior. It's not really a crash, but we also
   // want the fallback-to-sw behavior if we cannot initialize the GPU.
@@ skipping 795 matching lines @@
   if (!cache.get())
     return;
 
   cache->set_shader_loaded_callback(base::Bind(&GpuProcessHost::LoadedShader,
                                                weak_ptr_factory_.GetWeakPtr()));
 
   client_id_to_shader_cache_[client_id] = cache;
 }
 
 }  // namespace content