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The ReportingCache stores unsent and pending reports, as well as client
configurations. Previously, observers were notified upon any change to
any of the cached data. This change differentiates changes to the cached
reports from changes to the cached clients, and notifies observers
appropriately.

This will make it easier to add a ReportingStore class which will
observe the ReportingCache and persist the changed data to disk.

Also renames what was originally ReportingObserver to
ReportingCacheObserver to avoid confusion with the JavaScript
ReportingObserver interface
(https://w3c.github.io/reporting/#interface-reporting-observer).

Bug: none
Change-Id: I4afd530b703f04da0bcc53e8ad2d615cb4ed0238
Reviewed-on: https://chromium-review.googlesource.com/c/1362191Reviewed-by: Misha Efimov <mef@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614799}