Add a workaround for copyTexImage2D as it is sometimes broken on OSX.

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,
     'build_angle_deqp_tests%': 0,
   },
   'includes': [
@@ skipping 335 matching lines @@
         # 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_copy_tex_image_2d_workaround_unittest.cc',
         'command_buffer/tests/gl_cube_map_texture_unittest.cc',
         'command_buffer/tests/gl_depth_texture_unittest.cc',
         'command_buffer/tests/gl_dynamic_config_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',
         'command_buffer/tests/gl_fence_sync_unittest.cc',
         'command_buffer/tests/gl_gpu_memory_buffer_unittest.cc',
         'command_buffer/tests/gl_lose_context_chromium_unittest.cc',
         'command_buffer/tests/gl_manager.cc',
@@ skipping 604 matching lines @@
             ],
             'sources': [
               'gpu_unittests_apk.isolate',
             ],
           },
         ],
       },
     ],
   ],
 }