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The logic to decide delay for each Background Sync registration
is now completely in the chrome:// layer.

The logic to calculate the soonest_delay across registrations across
storage partitions for the browser context can be moved to content://
in a new class called BackgroundSyncScheduler.

This reduces an unnecessary interaction between chrome:// and content://
layer, allows more code to be shared with embedders of content://
and this logic can be completely tested by browser tests on
ContentShell.

This simplifies scheduling logic, and also improves testability.

Bug: 996166

Change-Id: I0aa15b9bcc35c0f2642c89d1d776668054992647
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1806576
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702300}