- only pass the authtoken through from the authenticator to the client
for getAuthToken() and strip it out from the other calls, like
addAccount(). http://b/2332762
- beef up the documentation to indicate what calls are allowed to be made
from the main thread and which are not allowed. http://b/2384961
- wait a bit before retrying syncs that failed because one was already
in progress. http://b/2414235
8570f74407