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WebRTC currenty passes only the codec selection to the decoders but not
the profile info. This has been working fine so far because we only had
different profiles under H264 and initializing the decoder with MAIN was
enough to cover all of them. However, this became problematic when we
introduce VP9.2, as it is a 10-bit codec that decoder needs to know and
initialize in advance.

This CL changes the decoder creation methods such that
webrtc::SdpVideoFormat is passed and parsed for profile information. This
will allow us to enabled VP9.2 HW decoder usage.

Bug: 908945,webrtc:9376
Change-Id: I6959c85fe4074ca1644e6fb02d58d10df2ff0cff
Reviewed-on: https://chromium-review.googlesource.com/c/1363804
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615739}