Since we only care about driver state tracking logic, blit is unrelated here. This further reduce the noise of test result. Instead of blit and swap every N frame, we will issue glFlush for offscreen rendering. The onscreen will still issue swap every frame. Bug: b/186881553 Change-Id: Id048eaafa6dcef26d851fd19f069331d240e1bf5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2846527 Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Ian Elliott <ianelliott@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com>
