Fix crash caused by concurrent access to framebuffer_combo_complete_map_.

gpu/command_buffer_service.gypi

 # 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_dirs': [
     '..',
   ],
   'all_dependent_settings': {
     'include_dirs': [
@@ skipping 43 matching lines @@
     'command_buffer/service/context_group.cc',
     'command_buffer/service/context_group.h',
     'command_buffer/service/context_state.cc',
     'command_buffer/service/context_state.h',
     'command_buffer/service/context_state_autogen.h',
     'command_buffer/service/context_state_impl_autogen.h',
     'command_buffer/service/error_state.cc',
     'command_buffer/service/error_state.h',
     'command_buffer/service/feature_info.cc',
     'command_buffer/service/feature_info.h',
+    "command_buffer/service/framebuffer_completeness_cache.cc",
+    "command_buffer/service/framebuffer_completeness_cache.h",
     'command_buffer/service/framebuffer_manager.cc',
     'command_buffer/service/framebuffer_manager.h',
     'command_buffer/service/gl_context_virtual.cc',
     'command_buffer/service/gl_context_virtual.h',
     'command_buffer/service/gl_state_restorer_impl.cc',
     'command_buffer/service/gl_state_restorer_impl.h',
     'command_buffer/service/gl_utils.h',
     'command_buffer/service/gles2_cmd_clear_framebuffer.cc',
     'command_buffer/service/gles2_cmd_clear_framebuffer.h',
     'command_buffer/service/gles2_cmd_copy_texture_chromium.cc',
@@ skipping 81 matching lines @@
       },
     }],
     ['OS in ("win", "android") or (OS == "linux" and use_x11 == 1)', {
       'sources': [
         'command_buffer/service/async_pixel_transfer_manager_egl.cc',
         'command_buffer/service/async_pixel_transfer_manager_egl.h',
       ],
     }],
   ],
 }