This can be useful for our testing code, to filter based on system
configurations, such as GPU type, OS, or Debug/Release.

BUG=angleproject:998

Change-Id: I88b7fe1a7a1446262cc084e62cdb335776fa8912
Reviewed-on: https://chromium-review.googlesource.com/274422Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>