GN build improvements.

ui/events/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/ui.gni")
 
 static_library("dom4_keycode_converter") {
   sources = [
     "keycodes/dom4/keycode_converter.cc",
     "keycodes/dom4/keycode_converter.h",
@@ skipping 23 matching lines @@
     "latency_info.cc",
     "latency_info.h",
   ]
 
   defines = [ "EVENTS_BASE_IMPLEMENTATION" ]
 
   deps = [
     ":dom4_keycode_converter",
     "//base",
     "//base/third_party/dynamic_annotations",
+    "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   if (use_x11) {
     configs += [ "//build/config/linux:x11" ]
 
     sources += [
       "keycodes/keyboard_code_conversion_x.cc",
       "keycodes/keyboard_code_conversion_x.h",
       "x/device_data_manager.cc",
@@ skipping 242 matching lines @@
     ":events",
     ":events_base",
     ":events_test_support",
     ":gesture_detection",
     "//base",
     "//base/test:run_all_unittests",
     "//testing/gtest",
     "//ui/gfx:gfx_test_support",
   ]
 }