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Adds a metric to record the number of Chrome Siri Shortcuts the user has
created in the Siri Shortcuts app. This is recorded once at startup, as
a delayed startup task on the IO thread (to avoid hangs while querying
iOS for the list of shortcuts).

Bug: 935211
Change-Id: I70766050ba7faf5fb343e3515c98ff6ddca98bd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429306
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813030}