Change-Id: Ib789362bc0a8aa5460cfce61fef141cb22747b33

Change-Id: I0273a31e49c5367b89b9899553e3ebe13ec50687
Reviewed-on: https://boringssl-review.googlesource.com/1050
Reviewed-by: Adam Langley <agl@google.com>

PR#3286

(Imported from upstream's d52eb82781)

Initial fork from f2d678e6e8 (1.0.2 beta).

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