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Add a bubble view notification that will alert end users when they
are getting low on disk space availability, a state known as storage
pressure. Notification will be triggered when a site attempts to store
something using a quota managed storage API (IndexedDB, FileSystem,
AppCache, or CacheStorage) that would take the user below 15% disk
availability. The notification will be limited to show at most once
per day.

Bug: 997258
Change-Id: I4ef84cbe8679eead70fd79546a392b84d32afad4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1794271Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727392}