Ilya Nikolaevskiy 5054f54457 Partial frame capture API part 2
Implement test utility for extracting changed part of video frames.

Bug: webrtc:10152
Change-Id: Iead052d2a18384aaa828cd7821be961b8614568e
Reviewed-on: https://webrtc-review.googlesource.com/c/120407
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26496}
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