GitLab

DlpContentTabHelper is being attached to WebContents and tracks all the
frames inside and visibility of WebContents.
This information is reported to DlpContentManager that collects it from
all WebContents and tracks whether any of confidential data is currently
visible.

Bug: 1104884
Test: Unit tests added.

Change-Id: I02ae3d1bec7485569592e7fa746f6e6c06c991d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288104
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Nikita Podguzov <nikitapodguzov@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793671}