Add a group policy controlling which sites can install extensions.

chrome/test/functional/policy_test_cases.py

 #!/usr/bin/env python
 # 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.
 
 # This data is in a separate file so that src/chrome/app/policy/PRESUBMIT.py
 # can load it too without having to load pyautolib.
 
 # DO NOT import pyauto from here! This file is required to run a presubmit
 # scripts that will always fail if pyautolib isn't available, which is common.
@@ skipping 119 matching lines @@
     'AllowCrossOriginAuthPrompt':
         ('kAllowCrossOriginAuthPrompt', False, [], ['win', 'mac', 'linux']),
     'ExtensionInstallBlacklist':
         ('kExtensionInstallDenyList', ['*'], [], OS_ALL),
     'ExtensionInstallWhitelist':
         ('kExtensionInstallAllowList', ['lcncmkcnkcdbbanbjakcencbaoegdjlp'],
          [], OS_ALL),
     'ExtensionInstallForcelist':
       ('kExtensionInstallForceList', ['lcncmkcnkcdbbanbjakcencbaoegdjlp;' +
        'https://clients2.google.com/service/update2/crx'], [], OS_ALL),
+    'ExtensionInstallSources':
+        ('kExtensionInstallSources', ['https://www.corp.monkey.net/*'],
+         [], OS_ALL),
     'ShowHomeButton': ('kShowHomeButton', True, [BROWSER], OS_ALL),
     'DeveloperToolsDisabled': ('kDevToolsDisabled', True, [], OS_ALL),
     'RestoreOnStartup': (None, 5, [BROWSER], OS_ALL),
     # TODO(joaodasilva): Should be BROWSER. http://crbug.com/97749
     'RestoreOnStartupURLs':
         ('kURLsToRestoreOnStartup', ['chromium.org'], [], OS_ALL),
     # TODO(joaodasilva): The banner is out of place. http://crbug.com/77791
     'BlockThirdPartyCookies':
         ('kBlockThirdPartyCookies', True, [CONTENT], OS_ALL),
     # TODO(joaodasilva): Should be BROWSER. http://crbug.com/97749
@@ skipping 130 matching lines @@
     'ReportDeviceLocation': (None, False, [], ['chromeos']),
 
     # Chrome Frame policies:
     'ChromeFrameRendererSettings': (None, 0, [], []),
     'RenderInChromeFrameList': (None, ['google.com'], [], []),
     'RenderInHostList': (None, ['google.com'], [], []),
     'ChromeFrameContentTypes': (None, ['text/xml'], [], []),
     'GCFUserDataDir': (None, '${user_name}/test-frame', [], []),
     'AdditionalLaunchParameters': (None, '--enable-media-stream', [], []),
   }