GN: Create a :gles2_interface target to resolve some check errors in //cc.

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 452 matching lines @@
 
   if (is_win) {
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     cflags = [ "/wd4267" ]  # size_t -> int
   }
 
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//gpu",
+    "//gpu/command_buffer/client:gles2_interface",
     "//media",
     "//skia",
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
   forward_dependent_configs_from = [
     "//skia",
   ]
@@ skipping 142 matching lines @@
     "//testing/gtest",
     "//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" ]
   }
+
+  forward_dependent_configs_from = [
+    "//gpu:test_support",

[jbroman, 2014/08/13 19:27:16]

test_context_provider.h includes gles2_interface_stub.h from //gpu:test_support.

+  ]
 }
 
 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 112 matching lines @@
     "test/cc_test_suite.cc",
   ]
 
   deps = [
     ":cc",
     ":test_support",
     "//base/test:test_support",
     "//cc/surfaces",
     "//gpu",
     "//gpu:test_support",
+    "//gpu/command_buffer/client:gles2_interface",

[jbroman, 2014/08/13 19:27:16]

//cc doesn't forward configs for this, and I believe it shouldn't (since it's
not used in any cc headers). Adding explicit dependency here, since
renderer_pixeltest.cc uses gles2_interface.h.

     "//gpu/command_buffer/common:gles2_utils",
     "//media",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }
 
@@ skipping 22 matching lines @@
     "//gpu/command_buffer/common:gles2_utils",
     "//media",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }