Optimize Vertex Shader Attribute Type Validition Improves ValidateVertexShaderAttributeTypeMatch by storing vertex attributes types into masks for quick comparisons when needed. This shows 2% improvement to glDrawElements for the aquarium workload. BUG=angleproject:2202 Change-Id: I87fa3d30c3d8cdba6dfd936cd1a41fd27b1c6b77 Reviewed-on: https://chromium-review.googlesource.com/814795 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>