Enable support for notifications layout tests in test shell....

webkit/tools/test_shell/test_shell.gypi

 # Copyright (c) 2010 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': {
     'test_shell_windows_resource_files': [
       'resources/test_shell.rc',
       'resources/pan_east.cur',
       'resources/pan_middle.cur',
@@ skipping 52 matching lines @@
         'drag_delegate.h',
         'drop_delegate.cc',
         'drop_delegate.h',
         'event_sending_controller.cc',
         'event_sending_controller.h',
         'foreground_helper.h',
         'layout_test_controller.cc',
         'layout_test_controller.h',
         'mock_spellcheck.cc',
         'mock_spellcheck.h',
+        'notification_presenter.cc',
+        'notification_presenter.h',
         'plain_text_controller.cc',
         'plain_text_controller.h',
         'resource.h',
         'test_navigation_controller.cc',
         'test_navigation_controller.h',
         'test_shell.cc',
         'test_shell.h',
         'test_shell_devtools_agent.cc',
         'test_shell_devtools_agent.h',
         'test_shell_devtools_callargs.cc',
@@ skipping 705 matching lines @@
       ],
     }],
   ],
 }
 
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