[Extensions] Propagate activeTab hosts to extension background pages

extensions/extensions.gyp

 # Copyright 2013 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,
   },
   'targets': [
     {
@@ skipping 1058 matching lines @@
         'renderer/script_injection_manager.h',
         'renderer/script_injector.h',
         'renderer/scripts_run_info.cc',
         'renderer/scripts_run_info.h',
         'renderer/send_request_natives.cc',
         'renderer/send_request_natives.h',
         'renderer/set_icon_natives.cc',
         'renderer/set_icon_natives.h',
         'renderer/static_v8_external_one_byte_string_resource.cc',
         'renderer/static_v8_external_one_byte_string_resource.h',
+        'renderer/tab_finder.cc',
+        'renderer/tab_finder.h',
         'renderer/test_features_native_handler.cc',
         'renderer/test_features_native_handler.h',
         'renderer/user_gestures_native_handler.cc',
         'renderer/user_gestures_native_handler.h',
         'renderer/user_script_injector.cc',
         'renderer/user_script_injector.h',
         'renderer/user_script_set.cc',
         'renderer/user_script_set.h',
         'renderer/user_script_set_manager.cc',
         'renderer/user_script_set_manager.h',
@@ skipping 142 matching lines @@
               '<(SHARED_INTERMEDIATE_DIR)/blink/devtools_resources.pak',
             ],
             'pak_output': '<(PRODUCT_DIR)/extensions_shell_and_test.pak',
           },
           'includes': [ '../build/repack_action.gypi' ],
         },
       ],
     },
   ]
 }