resolution_tracker_ should always represent the size of the DxgiFrame::frame_.
So it should not be actively reset.
Bug: webrtc:8045
Change-Id: I0b4d70ea69e4c2febfa369de50b555287c41fd99
Reviewed-on: https://chromium-review.googlesource.com/592248
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Zijie He <zijiehe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#19192}