Add Ozone stub implementations for NativeDisplayDelegate and TouchscreenDelegate

ui/display/display.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'display',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../ui/gfx/gfx.gyp:gfx',
         '../../ui/gfx/gfx.gyp:gfx_geometry',
       ],
       'defines': [
         'DISPLAY_IMPLEMENTATION',
       ],
       'sources': [
         'chromeos/display_mode.cc',
         'chromeos/display_mode.h',
         'chromeos/display_snapshot.cc',
         'chromeos/display_snapshot.h',
         'chromeos/native_display_delegate.h',
         'chromeos/native_display_observer.h',
         'chromeos/output_configurator.cc',
         'chromeos/output_configurator.h',
+        'chromeos/ozone/native_display_delegate_ozone.cc',
+        'chromeos/ozone/native_display_delegate_ozone.h',
+        'chromeos/ozone/touchscreen_delegate_ozone.cc',
+        'chromeos/ozone/touchscreen_delegate_ozone.h',
         'chromeos/x11/display_mode_x11.cc',
         'chromeos/x11/display_mode_x11.h',
         'chromeos/x11/display_snapshot_x11.cc',
         'chromeos/x11/display_snapshot_x11.h',
         'chromeos/x11/display_util_x11.cc',
         'chromeos/x11/display_util_x11.h',
         'chromeos/x11/native_display_delegate_x11.cc',
         'chromeos/x11/native_display_delegate_x11.h',
         'chromeos/x11/native_display_event_dispatcher_x11.cc',
         'chromeos/x11/native_display_event_dispatcher_x11.h',
@@ skipping 29 matching lines @@
       'defines': [
         'DISPLAY_IMPLEMENTATION',
       ],
       'sources': [
         'chromeos/test/test_display_snapshot.cc',
         'chromeos/test/test_display_snapshot.h',
       ],
     },
   ],
 }