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- Clients are able to specify a custom suppression duration for
 each notification entry overwriting the default one in config.
-TODO: Proto change.

Bug: 1005954
Change-Id: Idcdf018f9f32dc5b468aba9782b93d0c6a9df5ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815217
Auto-Submit: Hesen Zhang <hesen@chromium.org>
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701738}