Introduce the MaskedViewTargeter class

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 288 matching lines @@
         'layout/grid_layout.h',
         'layout/layout_constants.h',
         'layout/layout_manager.cc',
         'layout/layout_manager.h',
         'linux_ui/linux_ui.h',
         'linux_ui/linux_ui.cc',
         'linux_ui/status_icon_linux.h',
         'linux_ui/status_icon_linux.cc',
         'linux_ui/window_button_order_observer.h',
         'linux_ui/window_button_order_provider.cc',
+        'masked_view_targeter.cc',
+        'masked_view_targeter.h',
         'metrics.cc',
         'metrics.h',
         'metrics_aura.cc',
         'metrics_mac.cc',
         'mouse_constants.h',
         'mouse_watcher.h',
         'mouse_watcher_aura.cc',
         'mouse_watcher_view_host.cc',
         'mouse_watcher_view_host.h',
         'native_cursor.h',
@@ skipping 472 matching lines @@
         }],
         ['use_x11==1', {
           'dependencies': [
             '../events/platform/x11/x11_events_platform.gyp:x11_events_platform',
           ],
         }],
       ],
     },  # target_name: views_unittests
   ],
 }