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These tests are quite flaky. Unsure of the root cause. Disable them
until we can triage the failures. This should help clear up flakiness
on the ANGLE CQ.

Bug: 861814
Change-Id: I69c405731ee0cfe9bcb176a6ff82e0ce4ab4c1ae
Tbr: kbr@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1129388Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573426}