3097008de0
These fields will be used for bitstream validation in upcoming CLs. A new vp9_constants.h file is also added, containing common constants defined by the bitstream spec. Bug: webrtc:12354 Change-Id: If04256d83409069c8bee43ad41aed41c3707dfd3 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226060 Commit-Queue: Erik Språng <sprang@webrtc.org> Reviewed-by: Philip Eliasson <philipel@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34476}