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This was already added to menu item in a previous CL (behind a flag).

This CL allows SimpleMenuModel to specify that a menu item should be
flagged as "New" to help educate users about new features in Chrome.

Bug: 1098731
Change-Id: Ib2fd08acebb8731bcbfad83678017cf55f540b76
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264196
Commit-Queue: Dana Fried <dfried@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782170}