Note: bot:
https://ci.chromium.org/buildbot/chromium.gpu.fyi/Android%20Release%20%28NVIDIA%20Shield%20TV%29/

and example failing build:
https://ci.chromium.org/buildbot/chromium.gpu.fyi/Android%20Release%20%28NVIDIA%20Shield%20TV%29/4499

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0d82fa426466ef40e727287e8b09591af170277b

commit 0d82fa426466ef40e727287e8b09591af170277b
Author: Kenneth Russell <kbr@chromium.org>
Date: Tue Dec 05 09:41:38 2017

Mark Pixel_WebGL_PremultipliedAlpha_False failing on NVIDIA SHIELD TV.

Needed to get this bot green again.

BUG=791733
TBR=ynovikov@chromium.org
NOTRY=true

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: If14d4b875f650c2d7c4fb82393d4b3c3aad509cb
Reviewed-on: https://chromium-review.googlesource.com/808124
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521650}
[modify] https://crrev.com/0d82fa426466ef40e727287e8b09591af170277b/content/test/gpu/gpu_tests/pixel_expectations.py

Without one of these devices it'll be impossible for me to diagnose what's going on.

In  Issue 792139  we found that the AOSP version of Android M was breaking pixel tests on another bot. Pixel_WebGL_PremultipliedAlpha_False was also failing with a similar failure mode there. It's a strange coincidence though I doubt it's really the same issue.