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Related test updates: https://github.com/kenrussell/webgl-animometer/pull/6

Related Record_wpr instructions: https://www.chromium.org/developers/telemetry/record_a_page_set

Bug: 890539
Change-Id: Idfa349ab6c79c00a9868e782272b599cd57f6285
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380500Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Shrek Shao <shrekshao@google.com>
Cr-Commit-Position: refs/heads/master@{#802467}