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Before capturing video in Capture Mode,
it should be checked whether the captured area is allowed
according to the currently set Data Leak Prevention rules.
Also, when video is being captured and confidential content
appears in the area, the capture should be stopped via a callback.

Bug: 1133324
Change-Id: I28ddd46b4c10760d3631d5b934ea06facec31df6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438411
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Nikita Podguzov <nikitapodguzov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817695}