GitLab

This CL adds the functionality to store the ids of lazy subscriptions
in SharedPeferences. Later CL will consume this information to decide
whether the FCM message should be deferred until there are visible
activities or not.

Bug: 882887
Change-Id: Ic28dbfeb2b77020cd9b5e02b79f055e477d55aed
Reviewed-on: https://chromium-review.googlesource.com/1221532Reviewed-by: Peter Conn <peconn@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592774}