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Currently Microsoft H.264 encoder MFT is always used as WebRTC external
encoder without hardware acceleration. This change enables H.264
hardware MFT encoder on Windows.

Bug: 982799
Change-Id: Ia33812508034daa99dd3dc1fb64b83cb1d7c8465
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1777521
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745539}