Add //ui/* to "gn check"

.gn

Index: .gn
diff --git a/.gn b/.gn
index 8975f99b5a0991c7019c0ca4f356a76f5740c6cf..331538e710acf21c851f49e250acf4e04f4946c2 100644
--- a/.gn
+++ b/.gn
@@ -84,7 +84,40 @@ check_targets = [
   "//third_party/WebKit/Source/*",
   "//tools/*",
 
-  #"//ui/*",  # Just a few problems.
+  #"//ui/*",  # Work left on Chromeos w/ use_ozone. Some parts of UI that work:
+  "//ui/accessibility/*",
+  "//ui/android/*",
+  "//ui/app_list/*",
+  "//ui/aura/*",
+  "//ui/aura_extra/*",
+  "//ui/base/*",
+  "//ui/chromeos/*",
+  "//ui/compositor/*",
+  "//ui/display/*",
+  "//ui/events:events",  # Specifically avoid //ui/events/ozone
+  "//ui/events:events_base",
+  "//ui/events:events_unittests",
+  "//ui/file_manager/*",
+  "//ui/gfx/*",
+  "//ui/gl/*",
+  "//ui/keyboard/*",
+  "//ui/login/*",
+  "//ui/message_center/*",
+  "//ui/metro_viewer/*",
+  "//ui/mojo/*",
+  "//ui/native_theme/*",
+  "//ui/platform_window/*",
+  "//ui/resources/*",
+  "//ui/shell_dialogs/*",
+  "//ui/snapshot/*",
+  "//ui/strings/*",
+  "//ui/surface/*",
+  "//ui/touch_selection/*",
+  "//ui/views/*",
+  "//ui/views_content_client/*",
+  "//ui/web_dialogs/*",
+  "//ui/webui/*",
+  "//ui/wm/*",
   "//url/*",
   "//v8/*",
   "//win8/*",