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

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 132 matching lines @@
 test("gl_tests") {
   sources = [
     "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_tex_image_2d_workaround_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_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",
@@ skipping 183 matching lines @@
     "//base",
     "//base/test:test_support",
     "//gpu/command_buffer/service",
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 }