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According to Qualcomm the unexpected blocking issue likely affects
"all A4x (or newer) chips", though the specific effect only seems
to be noticeable for WebVR on Daydream-ready devices which are 
currently limited to Adreno 530 and 540.

BUG=750306,764526
R=kbr

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: Ifb95ed9a59f58fb7b4a3c91e3745f5def6b51d21
Reviewed-on: https://chromium-review.googlesource.com/662903Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501463}