This is a temporary home for the various workarounds we use
for performance or to solve driver issues. Eventually we will
want a standalone library we can use as part of Chromium or
in ANGLE standalone.

BUG=angle:729

Change-Id: Ib0254262cad9f8fb779886dacb967be646ea96ae
Reviewed-on: https://chromium-review.googlesource.com/219838Reviewed-by: Brandon Jones <bajones@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>