We want to cover all of zlib's external APIs.
inflate() currently isn't covered.

BUG=779676

Change-Id: Ic8ea52f189a9870ea643d8d720a8e49f79f85422
Reviewed-on: https://chromium-review.googlesource.com/744338


Commit-Queue: Chris Blume <cblume@chromium.org>
Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#513374}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 1d1fe9219bcd06691028d3f84ac35a2d76b3f3b5