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The decoder microbenchmarks suffer from fairly high variance. This
should decrease the variance while not changing the absolute total.

Also add a mode for a fast test run on the bots with DCHECK enabled.
The test time on the perf bots should still be within one minute.

Bug: angleproject:2763
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Idf5fb0f4cb32205c8c640415b5e6ff22efa5b7b1
Reviewed-on: https://chromium-review.googlesource.com/c/1286753
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601261}