The black box version tests traditional GL API features. The white box
version is designed to test internal classes and uses a static link
against libANGLE and libGLESv2. The black box version will also be
extendable to test native drivers directly instead of going through
ANGLE.

Bug: angleproject:2995
Change-Id: I0b672db37ed38f82157c7a1db70080ff539337ce
Reviewed-on: https://chromium-review.googlesource.com/c/1359515
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>