The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2bf2095150ad43d8bcfe02dfad149078ae4cd361

commit 2bf2095150ad43d8bcfe02dfad149078ae4cd361
Author: Xiaohan Wang <xhwang@chromium.org>
Date: Wed Oct 24 00:20:16 2018

media: EME not support VP9 Profile 1 and 3

Currently VP9 profile 1 and 3 usage is super low, and hardware support
is poor. To avoid the complexity of having to check which platform,
device and/or decoder support them, with very little user benefit, we
decided to disable VP9 profile 1 and 3 support wholesale at a higher
level in EME implementation in Chromium.

Bug:  898298 
Test: Tests updated.
Change-Id: Id3a4dc4fee050a7714f4e0e754d62a338433ad0b
Reviewed-on: https://chromium-review.googlesource.com/c/1297295
Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602184}
[modify] https://crrev.com/2bf2095150ad43d8bcfe02dfad149078ae4cd361/chrome/browser/media/encrypted_media_supported_types_browsertest.cc
[modify] https://crrev.com/2bf2095150ad43d8bcfe02dfad149078ae4cd361/chromecast/renderer/media/key_systems_cast.cc
[modify] https://crrev.com/2bf2095150ad43d8bcfe02dfad149078ae4cd361/media/base/eme_constants.h
[modify] https://crrev.com/2bf2095150ad43d8bcfe02dfad149078ae4cd361/media/base/key_systems.cc