Optimize BindingsBenchmark::drawBenchmark. Fix contributed by matavenrath@nvidia.com. This fixes BindingsBenchmark::drawBenchmark to take only 3% instead of 15% of the time spent in BindingsBenchmark.Run/gl_100_objects_allocated_at_initialization. Bug: angleproject:2777 Change-Id: I5b5b6f167289b947767b40e7761d90cf06c49816 Reviewed-on: https://chromium-review.googlesource.com/1181868 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Frank Henigman <fjhenigman@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>