GitLab

- Changed AddIcons with a map of IconType and UUID as input.
- Complete ScheduleNotification logic.
- Added unit tests for adding icons.

Bug: 963290
Change-Id: Ie51437b08314712707f3b12c857dbfc18182adf8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771076
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690872}