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If you patch in https://pastebin.com/k1MTXxYt, this is enough to get poster circle "running" with black tiles.

The magic set of flags to run with this stub are:
--enable-gpu-rasterization --enable-oop-rasterization --enable-gpu-async-worker-context --enable-raster-decoder

Sample LOGs from stub: https://pastebin.com/48sGk6cM

BUG=789238

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I5ce826f68acdfb7ca23a2fb7698d156bf1a7505c
Reviewed-on: https://chromium-review.googlesource.com/820150
Commit-Queue: Jonathan Backer <backer@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Victor Miura <vmiura@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524728}