Add tests to verify accelerators properly work on constrained window.

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 569 matching lines @@
       ],
       'sources': [
         'test/capture_tracking_view.cc',
         'test/capture_tracking_view.h',
         'test/child_modal_window.cc',
         'test/child_modal_window.h',
         'test/desktop_test_views_delegate.cc',
         'test/desktop_test_views_delegate.h',
         'test/test_views_delegate.cc',
         'test/test_views_delegate.h',
+        'test/test_widget_observer.cc',
+        'test/test_widget_observer.h',
         'test/views_test_base.cc',
         'test/views_test_base.h',
       ],
       'conditions': [
         ['use_aura==1', {
           'dependencies': [
             '../aura/aura.gyp:aura_test_support',
             '../compositor/compositor.gyp:compositor',
           ],
         }, {  # use_aura==0
@@ skipping 384 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
   ],
 }