Make WebView work for external displays (over Presentations).

ui/android/ui_android.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 14 matching lines @@
       'sources' : [
         'resources/resource_manager.cc',
         'resources/resource_manager.h',
         'resources/resource_manager_impl.cc',
         'resources/resource_manager_impl.h',
         'resources/ui_resource_android.cc',
         'resources/ui_resource_android.h',
         'resources/ui_resource_client_android.h',
         'resources/ui_resource_provider.cc',
         'resources/ui_resource_provider.h',
+        'screen_android.cc',
         'ui_android_export.h',
         'ui_android_jni_registrar.cc',
         'ui_android_jni_registrar.h',
         'view_android.cc',
         'view_android.h',
         'window_android.cc',
         'window_android.h',
         'window_android_compositor.h',
         'window_android_observer.h',
       ],
@@ skipping 140 matching lines @@
         'ui_android_unittests',
         'ui_java',
       ],
       'variables': {
         'test_suite_name': 'ui_android_unittests',
       },
       'includes': [ '../../build/apk_test.gypi' ],
     },
   ],
 }