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This CL extends a few notification related flags.

Bug: NONE
Change-Id: I0e2d0d642215a34e4252c0cd4196ec17448245f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415329Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807950}