Added cloud print private API GetClientId

Added a cloud print private API called GetClientId which returns the Client ID
used to create OAuth2 tokens for cloud print services. This will be used in the
connector.

BUG=174263


Review URL: https://chromiumcodereview.appspot.com/12559004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@187391 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed