Add //ui/* to "gn check"

ui/base/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/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
@@ skipping 600 matching lines @@
       "test/ios/ui_view_test_utils.h",
       "test/ios/ui_view_test_utils.mm",
     ]
   }
 
   public_deps = [
     ":base",
   ]
   deps = [
     "//base",
+    "//base/test:test_config",
     "//skia",
     "//testing/gtest",
     "//ui/events:events_base",
+    "//ui/events:test_support",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   if (build_ime) {
     sources += [
       "ime/dummy_input_method.cc",
       "ime/dummy_input_method.h",
       "ime/dummy_text_input_client.cc",
       "ime/dummy_text_input_client.h",
@@ skipping 257 matching lines @@
   }
   if (is_mac) {
     data += [ "$root_out_dir/ui_unittests Framework.framework/" ]
 
     if (is_asan && symbol_level == 0) {
       data += [ "$root_out_dir/ui_base_unittests.dSYM/" ]
     }
   }
 }
 # TODO(GYP) Mac (ui_base_tests_bundle)