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For taking the VP9 HDR metadata from the video container and passes it to MediaCodec
Reference for packing HDR metadata in MediaFormat:
https://github.com/google/ExoPlayer/pull/2729/commits/e93ce41a285fe6b0493faa91523b010469591be7

Bug: internal b/68950223
Test: none
Change-Id: Id2b83c98a0844832f3bdfae7e3bd1dfa9c3728dc
Reviewed-on: https://chromium-review.googlesource.com/755952Reviewed-by: Fredrik Hubinette <hubbe@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Sergey Volk <servolk@chromium.org>
Commit-Queue: Sandeep Vijayasekar <sandv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521100}