Add osmesa to GN build.

cc/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.
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
     "animation/animation_curve.cc",
     "animation/animation_curve.h",
@@ skipping 584 matching lines @@
   ]
 
   include_dirs = [
     ".",
     "test",
   ]
 
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
-    "//gpu:gpu_unittest_utils",
+    "//gpu:test_support",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//gpu/command_buffer/client:gles2_implementation",
     "//gpu/command_buffer/client:gl_in_process_context",
     "//gpu/skia_bindings",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
-    # TODO(GYP)
-    #"//third_party/mesa/mesa.gyp:osmesa",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx:test_support",
     "//ui/gl",
   ]
+
+  if (!is_android) {  # TODO(GYP) Enable on Android when osmesa links.
+    deps += [ "//third_party/mesa:osmesa" ]
+  }
 }
 
 test("cc_unittests") {
   sources = [
     "animation/animation_unittest.cc",
     "animation/keyframed_animation_curve_unittest.cc",
     "animation/layer_animation_controller_unittest.cc",
     "animation/scroll_offset_animation_curve_unittest.cc",
     "animation/scrollbar_animation_controller_linear_fade_unittest.cc",
     "animation/scrollbar_animation_controller_thinning_unittest.cc",
@@ skipping 110 matching lines @@
     "test/run_all_unittests.cc",
     "test/cc_test_suite.cc",
   ]
 
   deps = [
     ":cc",
     ":test_support",
     "//base/test:test_support",
     "//cc/surfaces",
     "//gpu",
-    "//gpu:gpu_unittest_utils",
+    "//gpu:test_support",
     "//media",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }
 
 test("cc_perftests") {
@@ skipping 10 matching lines @@
     "trees/layer_tree_host_common_perftest.cc",
     "trees/layer_tree_host_perftest.cc",
     "trees/occlusion_tracker_perftest.cc",
   ]
 
   deps = [
     ":cc",
     ":test_support",
     "//base",
     "//gpu",
-    "//gpu:gpu_unittest_utils",
+    "//gpu:test_support",
     "//media",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }