Fix crash caused by concurrent access to framebuffer_combo_complete_map_.

content/common/gpu/gpu_channel_manager.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/common/gpu/gpu_channel_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 61 matching lines @@
   return program_cache_.get();
 }
 
 gpu::gles2::ShaderTranslatorCache*
 GpuChannelManager::shader_translator_cache() {
   if (!shader_translator_cache_.get())
     shader_translator_cache_ = new gpu::gles2::ShaderTranslatorCache;
   return shader_translator_cache_.get();
 }
 
+gpu::gles2::FramebufferCompletenessCache*
+GpuChannelManager::framebuffer_completeness_cache() {
+  if (!framebuffer_completeness_cache_.get())
+    framebuffer_completeness_cache_ =
+        new gpu::gles2::FramebufferCompletenessCache;
+  return framebuffer_completeness_cache_.get();
+}
+
 void GpuChannelManager::RemoveChannel(int client_id) {
   Send(new GpuHostMsg_DestroyChannel(client_id));
   gpu_channels_.erase(client_id);
 }
 
 int GpuChannelManager::GenerateRouteID() {
   static int last_id = 0;
   return ++last_id;
 }
 
@@ skipping 187 matching lines @@
   }
   return default_offscreen_surface_.get();
 }
 
 void GpuChannelManager::OnFinalize() {
   // Quit the GPU process
   base::MessageLoop::current()->Quit();
 }
 
 }  // namespace content