Add 4k HW decode override flag and support larger bitstream buffers in V4L2VDA.
Add a flag to override 4k hardware video decode capability detection in GVD if needed. This is for platforms that currently do not give us a proper way to detect it. Also bump input bistream size in V4L2VDA to accommodate potentially larger streams in higher resolutions. We cannot estimate input buffer size based on the stream, as we do not currently pass video config info down to the VDAs, and the bitstream buffers are needed in order to parse the stream to get that information. BUG=373717 TEST=4k video playback Review URL: https://codereview.chromium.org/285343003 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271653 0039d316-1c4b-4281-b951-d872f2087c98
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