Ensure that reposting mouse events on Windows posts the message natively via the PostMessage API.

ui/views/views.gyp

 # Copyright (c) 2012 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,
   },
   'target_defaults': {
     'conditions': [
       ['use_aura==1', {
@@ skipping 481 matching lines @@
             'widget/tooltip_manager_win.h',
           ],
           'conditions': [
             ['OS=="win"', {
               'sources/': [
                 ['include', 'controls/menu/menu_insertion_delegate_win.h'],
                 ['include', 'controls/menu/native_menu_win.cc'],
                 ['include', 'controls/menu/native_menu_win.h'],
                 ['include', 'corewm/tooltip_win.cc'],
                 ['include', 'corewm/tooltip_win.h'],
+                ['include', 'event_utils_win.cc'],
                 ['include', 'widget/desktop_aura/desktop_screen_win.cc'],
                 ['include', 'widget/desktop_aura/desktop_drag_drop_client_win.cc'],
                 ['include', 'widget/desktop_aura/desktop_drop_target_win.cc'],
                 ['include', 'widget/desktop_aura/desktop_root_window_host_win.cc'],
                 ['include', 'widget/monitor_win.cc'],
                 ['include', 'widget/monitor_win.h'],
                 ['include', 'win/appbar.cc'],
                 ['include', 'win/appbar.h'],
               ],
             }],
@@ skipping 588 matching lines @@
           'sources/': [
             # This is needed because the aura rule strips it from the default
             # sources list.
             ['include', '^../../content/app/startup_helper_win.cc'],
           ],
         }],
       ],
     },  # target_name: views_examples_with_content_exe
   ],
 }