Pull in various gpu/command_buffer fixes from chromium

gpu/BUILD.gn

 # Copyright 2014 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.
 
 # GYP-to-GN project mappings:
 #
 #  gpu.gyp:command_buffer_client => //gpu/command_buffer/client
 #
 #  gpu.gyp:command_buffer_common => //gpu/command_buffer/common
 #
@@ skipping 157 matching lines @@
     "command_buffer/service/async_pixel_transfer_delegate_mock.h",
     "command_buffer/service/async_pixel_transfer_manager_mock.cc",
     "command_buffer/service/async_pixel_transfer_manager_mock.h",
     "command_buffer/service/buffer_manager_unittest.cc",
     "command_buffer/service/cmd_parser_test.cc",
     "command_buffer/service/command_buffer_service_unittest.cc",
     "command_buffer/service/common_decoder_unittest.cc",
     "command_buffer/service/context_group_unittest.cc",
     "command_buffer/service/feature_info_unittest.cc",
     "command_buffer/service/framebuffer_manager_unittest.cc",
+    "command_buffer/service/gl_context_mock.cc",
+    "command_buffer/service/gl_context_mock.h",
     "command_buffer/service/gl_surface_mock.cc",
     "command_buffer/service/gl_surface_mock.h",
     "command_buffer/service/gles2_cmd_decoder_unittest.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest.h",
     "command_buffer/service/gles2_cmd_decoder_unittest_0_autogen.h",
     "command_buffer/service/gles2_cmd_decoder_unittest_1.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_1_autogen.h",
     "command_buffer/service/gles2_cmd_decoder_unittest_2.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_2_autogen.h",
     "command_buffer/service/gles2_cmd_decoder_unittest_3.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_3_autogen.h",
     "command_buffer/service/gles2_cmd_decoder_unittest_async_pixel.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_attribs.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_base.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_base.h",
     "command_buffer/service/gles2_cmd_decoder_unittest_buffers.cc",
+    "command_buffer/service/gles2_cmd_decoder_unittest_context_lost.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_context_state.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_drawing.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_extensions.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_framebuffers.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_programs.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_textures.cc",
     "command_buffer/service/gles2_cmd_decoder_unittest_valuebuffer.cc",
     "command_buffer/service/gpu_scheduler_unittest.cc",
     "command_buffer/service/gpu_service_test.cc",
     "command_buffer/service/gpu_service_test.h",
@@ skipping 100 matching lines @@
     libs = [ "GL" ]
 
     configs += [ "//build/config/linux:x11" ]
 
     deps = [
       "//base",
       "//ui/gl",
     ]
   }
 }