[MacViews] Enable dragging a window by its caption/draggable areas.

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/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 555 matching lines @@
     "test/nswindow_fullscreen_notification_waiter.h",
     "test/nswindow_fullscreen_notification_waiter.mm",
     "test/test_clipboard.cc",
     "test/test_clipboard.h",
     "test/ui_controls.h",
     "test/ui_controls_aura.cc",
     "test/ui_controls_internal_win.cc",
     "test/ui_controls_internal_win.h",
     "test/ui_controls_mac.mm",
     "test/ui_controls_win.cc",
+    "test/windowed_nsnotification_observer.h",
+    "test/windowed_nsnotification_observer.mm",
   ]
 
   public_deps = [
     ":base",
   ]
   deps = [
     "//base",
     "//skia",
     "//testing/gtest",
     "//ui/events:events_base",
@@ skipping 217 matching lines @@
   }
 
   if (is_chromeos) {
     deps += [
       "//chromeos",
       "//ui/events:dom_keycode_converter",
     ]
   }
 }
 # TODO(GYP) Mac (ui_base_tests_bundle)