MacViews: Adds NativeWidgetMac and gets views target compiling on Mac.

ui/events/events.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 99 matching lines @@
         'event_utils.h',
         'events_export.h',
         'events_stub.cc',
         'gestures/gesture_point.cc',
         'gestures/gesture_point.h',
         'gestures/gesture_provider_aura.cc',
         'gestures/gesture_provider_aura.h',
         'gestures/gesture_recognizer.h',
         'gestures/gesture_recognizer_impl.cc',
         'gestures/gesture_recognizer_impl.h',
+        'gestures/gesture_recognizer_impl_mac.cc',
         'gestures/gesture_sequence.cc',
         'gestures/gesture_sequence.h',
         'gestures/gesture_types.h',
         'gestures/motion_event_aura.cc',
         'gestures/motion_event_aura.h',
         'gestures/velocity_calculator.cc',
         'gestures/velocity_calculator.h',
         'ozone/events_ozone.cc',
         'win/events_win.cc',
         'x/events_x.cc',
@@ skipping 210 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'events_unittests',
           },
           'includes': [ '../../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }