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This CL introduces underlying source and sink classes for encoded video.
The source allows sending frames from WebRTC to a ReadableStream.
The sink allows sending frames from a WritableStream to WebRTC.

Bug: 1052765
Change-Id: I191c0deca35630a960e962913f0a42f89c306bb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080475Reviewed-by: Adam Rice <ricea@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Auto-Submit: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746280}