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H264 is most affected since VP9 gets 4K portrait support by virtue
of supporting 8K decoding. This cl also adds 8K portrait mode
support for VP9.

BUG=806568
TEST=manually verified video in bug gets GpuVideoDecoder.

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: I4c622e3d3e54c43f85c6d3af0d7624f66a0639b6
Reviewed-on: https://chromium-review.googlesource.com/891670Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532710}