Add settling delay to CroppingWindowCapturer

On Windows, DXGI can be slow to update the window position in the
screen capture because DWM composition is deferred to vsync. If a
window moves immediately before a capture attempt, the screen capture
might still show stale pixels from before the move.

This CL adds a check in CroppingWindowCapturer::CaptureFrame to detect
if the window has moved since the last capture attempt. If a move is
detected, we fallback to the window capturer for one frame to allow
DWM/DXGI to settle before we attempt screen capture again.

Fixed: chromium:518242046
Change-Id: I89dd5cdd30aeb9cca4e2877916dfbeb4aaa612c3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/477921
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/main@{#47899}