Fix ash 'gn check' errors; whitelist target.

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index e6ecc7244e83b589c5677f78cc2bbbf194de6501..76c050cf9bc1bde317f917d13b05de10d5e33062 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -45,6 +45,7 @@ component("ash") {
     "//ui/base:ui_data_pack",
     "//ui/base/ime",
     "//ui/compositor",
+    "//ui/display/types",
     "//ui/events",
     "//ui/events:events_base",
     "//ui/events:gesture_detection",
@@ -53,6 +54,8 @@ component("ash") {
     "//ui/gfx/geometry",
     "//ui/keyboard",
     "//ui/message_center",
+    "//ui/native_theme",
+    "//ui/platform_window",
     "//ui/platform_window/stub",
     "//ui/resources",
     "//ui/strings",
@@ -101,6 +104,7 @@ component("ash") {
       "//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",