Implement sidebar support for extension action popups

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.
 {
   'variables': {
     'chrome_browser_extensions_test_support_sources': [
       # A list of sources which is shared between different browser tests.
       'browser/apps/app_browsertest_util.cc',
       'browser/apps/app_browsertest_util.h',
       'browser/extensions/browsertest_util.cc',
@@ skipping 1042 matching lines @@
       'browser/ui/views/find_bar_controller_interactive_uitest.cc',
       'browser/ui/views/find_bar_host_interactive_uitest.cc',
       'browser/ui/views/frame/browser_view_focus_uitest.cc',
       'browser/ui/views/frame/browser_view_interactive_uitest.cc',
       'browser/ui/views/keyboard_access_browsertest.cc',
       'browser/ui/views/location_bar/location_icon_view_interactive_uitest.cc',
       'browser/ui/views/location_bar/star_view_browsertest.cc',
       'browser/ui/views/omnibox/omnibox_view_views_browsertest.cc',
       'browser/ui/views/passwords/manage_passwords_bubble_view_browsertest.cc',
       'browser/ui/views/passwords/manage_passwords_icon_view_browsertest.cc',
+      'browser/ui/views/sidebar/sidebar_browsertest.cc',
       'browser/ui/views/ssl_client_certificate_selector_browsertest.cc',
       'browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc',
       'browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h',
       'browser/ui/views/toolbar/toolbar_button_test.cc',
       'browser/ui/views/toolbar/toolbar_view_interactive_uitest.cc',
     ],
     'chrome_interactive_ui_test_notifications_sources': [
       'browser/extensions/api/notifications/notifications_apitest.cc',
       'browser/notifications/message_center_notifications_browsertest.cc',
     ],
@@ skipping 2188 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }