Change-Id: I489d0f7be06ff4b5e185728a680f4d78e653113e
Reviewed-on: https://boringssl-review.googlesource.com/1698
Reviewed-by: Adam Langley <agl@google.com>

Initial fork from f2d678e6e8 (1.0.2 beta).

(This change contains substantial changes from the original and
effectively starts a new history.)