GitLab

Implement an in-memory queue for UserEventSyncBridge to keep user consent
events while the store or change processor are not ready yet. The queue
will be processed as soon as store and change processor are initialized.

Bug: 781765

Change-Id: I0a7fb25d66dce548c0f1ae9cf5f99e869ea54ddc
Reviewed-on: https://chromium-review.googlesource.com/980975Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548132}