Take 2 at implementing activeTab.

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 35 matching lines @@
         '../webkit/support/webkit_support.gyp:webkit_resources',
         '../webkit/support/webkit_support.gyp:webkit_user_agent',
       ],
       'include_dirs': [
         '..',
         '<(INTERMEDIATE_DIR)',
       ],
       'sources': [
         # All .cc, .h, .m, and .mm files under browser/extensions except for
         # tests and mocks.
+        'browser/extensions/active_tab_permission_manager.cc',
+        'browser/extensions/active_tab_permission_manager.h',
         'browser/extensions/admin_policy.cc',
         'browser/extensions/admin_policy.h',
         'browser/extensions/api/api_function.cc',
         'browser/extensions/api/api_function.h',
         'browser/extensions/api/api_resource.cc',
         'browser/extensions/api/api_resource.h',
         'browser/extensions/api/api_resource_controller.cc',
         'browser/extensions/api/api_resource_controller.h',
         'browser/extensions/api/api_resource_event_notifier.cc',
         'browser/extensions/api/api_resource_event_notifier.h',
@@ skipping 611 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',
           ],
         }],
       ],
     },
   ],
 }