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In v1, the notification title is static "Time's up".
In v2, the notification title is the string representation of time
remaining.

Bug: b:156641714
Change-Id: Iefd3d42ed4f8c81499971d313db3fe81cc73a741
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216597Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#772377}