Fix ash 'gn check' errors; whitelist target.

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")
 import("//testing/test.gni")
 
 assert(use_aura)
 assert(enable_hidpi)
@@ skipping 27 matching lines @@
     "//net",
     "//skia",
     "//third_party/icu",
     "//ui/accessibility",
     "//ui/app_list",
     "//ui/aura",
     "//ui/base",
     "//ui/base:ui_data_pack",
     "//ui/base/ime",
     "//ui/compositor",
+    "//ui/display/types",
     "//ui/events",
     "//ui/events:events_base",
     "//ui/events:gesture_detection",
     "//ui/events/devices",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/keyboard",
     "//ui/message_center",
+    "//ui/native_theme",
+    "//ui/platform_window",
     "//ui/platform_window/stub",
     "//ui/resources",
     "//ui/strings",
     "//ui/views",
     "//ui/wm",
     "//url",
   ]
 
   if (is_win) {
     sources -= [
@@ skipping 28 matching lines @@
       "//ui/events/ozone:events_ozone",
       "//ui/ozone",
     ]
   }
 
   if (is_chromeos) {
     deps += [
       "//chromeos",
       "//chromeos:power_manager_proto",
       "//device/bluetooth",
+      "//third_party/WebKit/public:blink_headers",

[sky, 2016/02/10 00:04:35]

Please add a TODO to remove this. ash_with_content should be the only one
depending on webkit.

[msw, 2016/02/10 20:30:22]

Done.

       "//third_party/qcms",
       "//ui/chromeos:ui_chromeos",
       "//ui/chromeos/resources",
       "//ui/chromeos/strings",
       "//ui/display",
       "//ui/display/util",
     ]
   } else {
     sources -= [
       "accelerators/key_hold_detector.cc",
@@ skipping 294 matching lines @@
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
   if (is_chromeos) {
     deps += [ "//device/bluetooth" ]
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the ash_unittests_run target in ash.gyp.