GL: Fix GPU detection Always use GL_VENDOR to determine vendor. On multi-GPU systems, this ensures that the correct GPU is used to determine workarounds. GetSystemInfo is still broken in that it assumes the discrete GPU to be active, but with this change it will only affect the test infrastructure (and not users). Bug: chromium:1187475 Bug: angleproject:6174 Change-Id: I4dffadf0e28c73e01d6b4bf49ab708c0714cdc7c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3049350 Reviewed-by: Kenneth Russell <kbr@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>