Expose AES-GCM in the crypto library.

This will initially be used by cloud-assisted BLE, a protocol used by
the WebAuthN API to communicate with certain BLE devices without
explicit pairing.

Bug: 838568
Change-Id: I4aa08787e677c3cc0b74c2e818126ada05bdba54
Reviewed-on: https://chromium-review.googlesource.com/1037206
Commit-Queue: Kim Paulhamus <[email protected]>
Reviewed-by: Adam Langley <[email protected]>
Cr-Commit-Position: refs/heads/master@{#555071}
3 files changed