Add unit tests for class VideoCaptureDeviceMFWin

Bug: 786854
Change-Id: I6f51ed00b664d305166d092edd68891eaa0b7232
Reviewed-on: https://chromium-review.googlesource.com/890442
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536281}
5 files changed