Optimize Fragment Shader Type Match Validation Improves ValidateFragmentShaderColorBufferTypeMatch by storing input and output types into a bitmask for quick comparison when validation is needed. This shows a 2% improvement to glDrawElements for the aquarium workload. BUG=angleproject:2203 Change-Id: Iade2ecf28383164e370b48442f01fba6c0962fba Reviewed-on: https://chromium-review.googlesource.com/775019 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>