am 9f942089: Merge changes I9bd42a8a,I613d0b12 into jb-dev

* commit '9f94208953fc8da72140c2964bcf12ff5b485784':
  cherrypick from master docs: GCM changes Change-Id: Id5454e70455bae14ab4605021a6c1bcab0292ae9
  Doc update: Misc minor GCM updates.