Add //ui/* to "gn check"

ui/platform_window/android/BUILD.gn

 # Copyright 2015 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/android/rules.gni")
 import("//testing/test.gni")
 
 assert(is_android)
 
 component("android") {
@@ skipping 10 matching lines @@
 
   deps = [
     ":jni_headers",
     ":platform_window_java",
     "//base",
     "//skia",
     "//ui/events:events",
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
+    "//ui/platform_window",
   ]
 
   libs = [ "android" ]
 }
 
 generate_jni("jni_headers") {
   sources = [
     "java/src/org/chromium/ui/PlatformImeControllerAndroid.java",
     "java/src/org/chromium/ui/PlatformWindowAndroid.java",
   ]
   jni_package = "android_window"
 }
 
 android_library("platform_window_java") {
   java_files = [
     "java/src/org/chromium/ui/PlatformImeControllerAndroid.java",
     "java/src/org/chromium/ui/PlatformWindowAndroid.java",
   ]
   deps = [
     "//base:base_java",
   ]
 }