Add osmesa to GN build.

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 27 matching lines @@
   deps = [
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/common",
     "//gpu/command_buffer/service",
     "//gpu/command_buffer/client:gles2_cmd_helper",
     "//gpu/config",
     "//gpu/ipc",
   ]
 }
 
-source_set("gpu_unittest_utils") {
+source_set("test_support") {
   sources = [
     "command_buffer/service/gles2_cmd_decoder_mock.cc",
     "command_buffer/service/error_state_mock.cc",
     "command_buffer/client/gles2_interface_stub.cc",
     "command_buffer/client/gles2_interface_stub.h",
   ]
 
   configs += [ "//third_party/khronos:khronos_headers" ]
 
   deps = [
@@ skipping 31 matching lines @@
     "command_buffer/tests/gl_virtual_contexts_unittest.cc",
     "command_buffer/tests/occlusion_query_unittest.cc",
   ]
 
   defines = [
     "GL_GLEXT_PROTOTYPES",
   ]
 
   deps = [
     ":gpu",
-    ":gpu_unittest_utils",
+    ":test_support",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/angle:translator",
     "//ui/gfx",
     "//ui/gfx:test_support",
     "//ui/gfx/geometry",
     "//ui/gl",
     #"//gpu/command_buffer/client",  # These are all part of //gpu, needed?
@@ skipping 105 matching lines @@
     "config/gpu_driver_bug_list_unittest.cc",
     "config/gpu_info_collector_unittest.cc",
     "config/gpu_info_unittest.cc",
     "config/gpu_test_config_unittest.cc",
     "config/gpu_test_expectations_parser_unittest.cc",
     "config/gpu_util_unittest.cc",
   ]
 
   deps = [
     ":gpu",
-    ":gpu_unittest_utils",
+    ":test_support",
     "//base",
     "//base/test:test_support",
     "//base/third_party/dynamic_annotations",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/angle:translator",
     "//ui/gfx",
     "//ui/gfx:test_support",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//gpu/command_buffer/client:gles2_implementation_client_side_arrays",
   ]
 }
+
+test("angle_unittests") {
+  sources = [
+    "angle_unittest_main.cc",
+  ]
+
+  # TODO(GYP) / TODO(brettw) remove this when angle is rolled to include:
+  # https://chromium-review.googlesource.com/#/c/209452/
+  include_dirs = [ "//third_party/angle/include" ]
+
+  deps = [
+    "//base",
+    "//base/third_party/dynamic_annotations",
+    "//testing/gmock",
+    "//testing/gtest",
+    "//third_party/angle:translator_static",
+  ]
+}