- We weren't keeping track of mSize correctly, causing some very
specific index buffer bindings to fail. The size returned when allocating
the buffer can be a bit different than the size requested, and that extra
space between mSize and the allocated size was not meant to be used,
causing errors in the validation layers.

Bug: angleproject:2580
Change-Id: I47eb7b8de6f4f657de14385b77ba6a459add599b
Reviewed-on: https://chromium-review.googlesource.com/1118607Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Luc Ferron <lucferron@chromium.org>