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The consent will be shown to user:
- Cumulative 8 seconds (based on reading speed from notification study)
OR
- Up to a total of 3 times.

Bug: 1054575
Test: unit tests
Change-Id: Id05fe4edda8cf04005684d84ed7d36df32c06cd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2039890Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Li Lin <llin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743317}