command_buffer: Implement CHROMIUM_framebuffer_mixed_samples extension

gpu/gpu.gyp

 # 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.
 
 {
   'variables': {
     'nacl_win64_target': 0,
   },
   'includes': [
     'gpu_common.gypi',
@@ skipping 342 matching lines @@
         #'gl_unittests',
       ],
       'defines': [
         'GL_GLEXT_PROTOTYPES',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'command_buffer/tests/compressed_texture_test.cc',
         'command_buffer/tests/es3_misc_functions_unittest.cc',
         'command_buffer/tests/gl_bind_uniform_location_unittest.cc',
+        'command_buffer/tests/gl_chromium_framebuffer_mixed_samples_unittest.cc',
         'command_buffer/tests/gl_chromium_framebuffer_multisample_unittest.cc',
         'command_buffer/tests/gl_chromium_path_rendering_unittest.cc',
         'command_buffer/tests/gl_clear_framebuffer_unittest.cc',
         'command_buffer/tests/gl_compressed_copy_texture_CHROMIUM_unittest.cc',
         'command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc',
         'command_buffer/tests/gl_cube_map_texture_unittest.cc',
         'command_buffer/tests/gl_depth_texture_unittest.cc',
         'command_buffer/tests/gl_ext_blend_func_extended_unittest.cc',
         'command_buffer/tests/gl_ext_multisample_compatibility_unittest.cc',
         'command_buffer/tests/gl_ext_srgb_unittest.cc',
@@ skipping 543 matching lines @@
             ],
             'sources': [
               'gpu_unittests_apk.isolate',
             ],
           },
         ],
       },
     ],
   ],
 }