ServiceWorker: ServiceWorkerContextCoreObserver::OnRegistrationStored.

OnRegistrationStored is guaranteed to be called after a
ServiceWorkerRegistration has been persisted to ServiceWorkerStorage, so
observers can assume that methods like ServiceWorkerStorage::GetUserData
will find the registration.

Bug: 729800
Change-Id: I35181050b2f35a3b82c4f8e5a22383905b9bc482
Reviewed-on: https://chromium-review.googlesource.com/1043064
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556380}
5 files changed