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When confidential content appears in the capture area, the screen capture is being paused.
User should be notified about this via a notification.
The same should be done when the capture is resumed as the content leaves the capture area.

Bug: 1134566
Change-Id: Ide75999dda0cea04f14b56407513a47897fbc7eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2520834Reviewed-by: Nikita Podguzov <nikitapodguzov@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825373}