Take 2 at implementing activeTab.

chrome/chrome_renderer.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': 'renderer',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 93 matching lines @@
         'renderer/extensions/miscellaneous_bindings.cc',
         'renderer/extensions/miscellaneous_bindings.h',
         'renderer/extensions/page_actions_custom_bindings.cc',
         'renderer/extensions/page_actions_custom_bindings.h',
         'renderer/extensions/page_capture_custom_bindings.cc',
         'renderer/extensions/page_capture_custom_bindings.h',
         'renderer/extensions/send_request_natives.cc',
         'renderer/extensions/send_request_natives.h',
         'renderer/extensions/set_icon_natives.cc',
         'renderer/extensions/set_icon_natives.h',
+        'renderer/extensions/tab_finder.cc',
+        'renderer/extensions/tab_finder.h',
         'renderer/extensions/tabs_custom_bindings.cc',
         'renderer/extensions/tabs_custom_bindings.h',
         'renderer/extensions/tts_custom_bindings.cc',
         'renderer/extensions/tts_custom_bindings.h',
         'renderer/extensions/user_script_scheduler.cc',
         'renderer/extensions/user_script_scheduler.h',
         'renderer/extensions/user_script_slave.cc',
         'renderer/extensions/user_script_slave.h',
         'renderer/extensions/v8_schema_registry.cc',
         'renderer/extensions/v8_schema_registry.h',
@@ skipping 190 matching lines @@
           'sources!': [
             'renderer/extensions/experimental.usb_custom_bindings.cc',
             'renderer/extensions/experimental.usb_custom_bindings.h',
             'renderer/resources/extensions/experimental.usb_custom_bindings.js',
           ],
         }],
       ],
     },
   ],
 }