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This CL supports native input video frame from user media video track.
The video frame is converted to I420 by libyuv for software encoder.

Bug: 1045248
Change-Id: I2afb1a3c9c9fdf2c8b15312120c430f8e898d2b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359715
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799818}