Add chrome test support target to GN build.

ash/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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("ash.gyp") ],
@@ skipping 165 matching lines @@
     "//testing/gtest",
     "//ui/accessibility",
     "//ui/app_list",
     "//ui/app_list:test_support",
     "//ui/events:events_base",
     "//ui/gl",
     "//ui/views",
     "//ui/views:test_support",
   ]
 
+  forward_dependent_configs_from = [ ":ash" ]
+
   if (is_win) {
     sources += [
       "test/test_metro_viewer_process_host.cc",
       "test/test_metro_viewer_process_host.h",
     ]
     deps += [
       "//ipc",
       #'../ui/metro_viewer/metro_viewer.gyp:metro_viewer_messages',  TODO(GYP)
       #'../win8/win8.gyp:metro_viewer',  TODO(GYP)
       #'../win8/win8.gyp:test_support_win8',  TODO(GYP)
@@ skipping 179 matching lines @@
     "//content/test:test_support",
     "//skia",
     "//testing/gtest",
     "//ui/accessibility",
   ]
 
   if (is_chromeos) {
     deps += [ "//ui/display" ]
   }
 }