automerge: 2b7f0cf * commit '2b7f0cff1eebdb56a0c09bf5aec712df45147e25': Doc change: refactor GCM docs to be platform-agnostic.
automerge: 2b7f0cf * commit '2b7f0cff1eebdb56a0c09bf5aec712df45147e25': Doc change: refactor GCM docs to be platform-agnostic.