Support chrome.windows extension API events for browserless Panels.

chrome/chrome_browser_extensions.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 323 matching lines @@
         'browser/extensions/extension_management_api_constants.cc',
         'browser/extensions/extension_management_api_constants.h',
         'browser/extensions/extension_message_handler.cc',
         'browser/extensions/extension_message_handler.h',
         'browser/extensions/extension_message_service.cc',
         'browser/extensions/extension_message_service.h',
         'browser/extensions/extension_module.cc',
         'browser/extensions/extension_module.h',
         'browser/extensions/extension_navigation_observer.cc',
         'browser/extensions/extension_navigation_observer.h',
+        'browser/extensions/extension_panel_event_router.cc',
+        'browser/extensions/extension_panel_event_router.h',
         'browser/extensions/extension_pref_store.cc',
         'browser/extensions/extension_pref_store.h',
         'browser/extensions/extension_pref_value_map.cc',
         'browser/extensions/extension_pref_value_map.h',
         'browser/extensions/extension_pref_value_map_factory.cc',
         'browser/extensions/extension_pref_value_map_factory.h',
         'browser/extensions/extension_preference_api_constants.cc',
         'browser/extensions/extension_preference_api_constants.h',
         'browser/extensions/extension_preference_helpers.cc',
         'browser/extensions/extension_preference_helpers.h',
@@ skipping 343 matching lines @@
             'browser/extensions/api/usb/usb_api.h',
             'browser/extensions/api/usb/usb_device_resource.cc',
             'browser/extensions/api/usb/usb_device_resource.h',
           ],
         }],
       ],
     },
   ],
 }