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This is a reland of aa433c9b

Original change's description:
> DLP: Do not start screen capture for restricted content.
>
> During creation of a screen capture (desktop, window or tab) it needs to
> be checked whether the captured area contains any DLP
> (Data Leak Prevention) restricted content.
> The corresponding MediaAccessHandlers should do this check on Chrome OS.
>
> Bug: 1134566
> Change-Id: Id77739a9b6df9f3ed946e563d508c43df83b5580
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446329
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Reviewed-by: Yuri Wiitala <miu@chromium.org>
> Commit-Queue: Sergey Poromov <poromov@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#820713}

Cq-Include-Trybots: luci.chromium.try:mac10.15-blink-rel,mac_chromium_10.15_rel_ng
Bug: 1134566
Change-Id: Ie1bdd637d9364cc7e75248627c7393438353e230
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2497450Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820927}