GitLab

- Modified chromoting.py to enable me2me automation
- Added chromoting_helper.py to handle install, uninstall, enable, disable, changepin which requires admin privilege
- Added chromoting.base.py as the base for all chromoting test cases
- Modified chromoting_basic, renamed it it2me_basic and moved it under chromoting dir
- Added auth, me2me_enable, me2me_connect test
- Added a cert and a private key for signing host on mac
- Added mock_pref_pane.* files to mock the pref pane for different scenarios


NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/10821015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151717 0039d316-1c4b-4281-b951-d872f2087c98