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This CL adds test to cover all functions in NotificationScheduler.

Bug: 963304
Change-Id: I9f63cd4ec9e1e3ed761c10ac7f2e0539294e026c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732289
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: Hesen Zhang <hesen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684117}