Add policies to control the disk cache size.

chrome/test/functional/policy_prefs_ui.py

 #!/usr/bin/python
 # Copyright (c) 2011 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.
 
 # If this test is failing, please check these steps.
 #
 # - You introduced a new policy:
 #   Cool! Edit |policies| below and add an entry for it. See the comment above
 #   it for the format.
@@ skipping 88 matching lines @@
     'PasswordManagerAllowShowPasswords': (False, [ PERSONAL ]),
     'AutoFillEnabled': (False, [ PERSONAL ]),
     'DisabledPlugins': (['Flash'], []),
     'EnabledPlugins': (['Flash'], []),
     'DisabledPluginsExceptions': (['Flash'], []),
     'DisablePluginFinder': (True, []),
     # TODO(joaodasilva): Should be PERSONAL. http://crbug.com/97749
     'SyncDisabled': (True, []),
     'UserDataDir': ('${users}/${user_name}/chrome-test', [], [ 'win', 'mac' ]),
     'DiskCacheDir': ('${user_home}/test-cache', [], [ 'win', 'mac', 'linux' ]),
+    'DiskCacheSize': (100, [], [ 'win', 'mac', 'linux' ]),
+    'MediaCacheSize': (200, [], [ 'win', 'mac', 'linux' ]),
     'DownloadDirectory': ('${user_home}/test-downloads', [ ADVANCED ],
                           [ 'win', 'mac', 'linux' ]),
     'ClearSiteDataOnExit': (True, [ CONTENT ]),
     # TODO(joaodasilva): Should be ADVANCED. http://crbug.com/97749
     'ProxyMode': ('direct', [], [ 'win', 'mac', 'linux' ]),
     # TODO(joaodasilva): Should be ADVANCED. http://crbug.com/97749
     'ProxyServerMode': (0, [], [ 'win', 'mac', 'linux' ]),
     'ProxyServer': ('http://localhost:8080', [], [ 'win', 'mac', 'linux' ]),
     'ProxyPacUrl': ('http://localhost:8080/proxy.pac', [],
                     [ 'win', 'mac', 'linux' ]),
@@ skipping 207 matching lines @@
 
     self.SetPolicies(policy_dict)
     self.assertTrue(self.IsBannerVisible())
 
     self.SetPolicies({})
     self.assertFalse(self.IsBannerVisible())
 
 
 if __name__ == '__main__':
   pyauto_functional.Main()