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As per anicolao@'s advice, this CL converts surface invariants violations dumps
into an optional feature whereas we always report UMA. This allows us to ship
with invariants violations that do not impact the user experience.

Bug: 814690, 672962
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I206bc32d30afcccc8dd0e0200601961c72943a1f
Reviewed-on: https://chromium-review.googlesource.com/962929Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543187}