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CastSoftwareVideoEncoderAdapter implements WebrtcVideoEncoder by using a
media::cast::SoftwareVideoEncoder.

This implementation is now only buildable, we still need several changes to make
it work. E.g. converting the DesktopFrame data from ARGB to I420. I am working
on a WebRTC change for it. Currently this kind of conversions have been
implemented several times across Chromium.

Bug: chromium:781432
Change-Id: Ia259bc0478957d2cef492cbdb418202bfda72a4b
Reviewed-on: https://chromium-review.googlesource.com/754060Reviewed-by: Xiangjun Zhang <xjz@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Zijie He <zijiehe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517261}