Introduce ActiveScriptController; track active extension scripts

chrome/chrome_tests.gypi

 # 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.
 {
   'includes': [
     'js_unittest_vars.gypi',
   ],
   'targets': [
     {
       'target_name': 'interactive_ui_tests',
@@ skipping 981 matching lines @@
         'browser/devtools/device/port_forwarding_browsertest.cc',
         'browser/devtools/devtools_sanity_browsertest.cc',
         'browser/dom_distiller/dom_distiller_viewer_source_browsertest.cc',
         'browser/do_not_track_browsertest.cc',
         'browser/download/download_browsertest.cc',
         'browser/download/download_browsertest.h',
         'browser/download/download_danger_prompt_browsertest.cc',
         'browser/download/download_started_animation_browsertest.cc',
         'browser/download/save_page_browsertest.cc',
         'browser/errorpage_browsertest.cc',
+        'browser/extensions/active_script_controller_browsertest.cc',
         'browser/extensions/active_tab_apitest.cc',
         'browser/extensions/activity_log/activity_log_browsertest.cc',
         'browser/extensions/activity_log/ad_injection_browsertest.cc',
         'browser/extensions/activity_log/uma_policy_browsertest.cc',
         'browser/extensions/alert_apitest.cc',
         'browser/extensions/all_urls_apitest.cc',
         'browser/extensions/api/activity_log_private/activity_log_private_apitest.cc',
         'browser/extensions/api/app_window/app_window_apitest.cc',
         'browser/extensions/api/audio/audio_apitest.cc',
         'browser/extensions/api/automation/automation_apitest.cc',
@@ skipping 1941 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }