These are the easy, automated cases. There were some more where we
need to fight Gerrit and the CLA system to extract the appropriate
metadata.

Updates #12042

Change-Id: Id63ae635ee7efeec4cd372c7d85bb5b1f557951b
Reviewed-on: https://go-review.googlesource.com/18264Reviewed-by: Ian Lance Taylor <iant@golang.org>