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According to the latest UX mocks, when the running video screen capture
is interrupted due to confidential content that appears in the captured area
a corresponding notification should be shown to the user.
See mocks: https://docs.google.com/presentation/d/1v0GM-lwHCznFJ6hnZlUH37eBOuAkJMw5Q6UnSkcKOgA/edit?hl=en#slide=id.ga41d6e7481_4_0

Bug: 1133324
Change-Id: Ibde37d0d5980b2ebe67f5b69cc2ab3f96e4fab99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502341
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821684}