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This CL adds a class to cache API calls before NotificationScheduler
async initialization is done.

Bug: 930968
Change-Id: Ic4bff46205393d684ec7c825e96daad788d0a914
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1573240Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652398}