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For persistent notifications, get the app_id based on the scope url for
the notification.

For non-persistent notifications, get app_ids based on the origin url of
the notification.

TODO: Add web page notifications for WebApps.
TODO: Add tests.

BUG=1068884

Change-Id: I9e453c2095176e74f9db2da7fb74ae71ea05f67d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2162504
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763443}