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This CL enables VEA native input mode in RTCVideoEncoder when the
input frame is backed by GpuMemoryBuffer.  To support frame scaling
for simulcast use cases, we also extend VAAPI video encoder to
scale the input frame with VAAPI video post-processing.

Bug: 982201
Test: Manually test on DUT with Hangouts Meet.
Change-Id: I8f68f492f07d7d8fbdb2686d611cc045ab4f38e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716023Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703580}