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libwebrtc can know the information about encoders that are not
contained in the library, by webrtc::EncoderInfo. In the current
chrome implementation, the structure stops in RtcVideoEncoder and
thus the filled information doesn't respect the hw encoders.

This Cl introduces VideoEncoderInfo. It is similar to
webrtc::EncoderInfo. The information is filled in and dealt with
the structure in chrome code.

Bug: 1031965
Test: webrtc.DecoderPerf.h264_hw
Test: webrtc.PeerConnection*
Change-Id: I5305d69be7ff8b7406be6493125f535cd5473ab6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972742Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726644}