This patch covers the basic implementation in the buffer storage.

BUG=angle:511

Change-Id: Ie7dcb11e42e568115521cc3e4ed479d3486ac957
Reviewed-on: https://chromium-review.googlesource.com/193621Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>