Add missing change notification dispatches.

These missing dispatches were leading tests to be flaky since they
would only pass if some other activity happened to dispatch the
notificatons at the same time.

Test: tsAppSearchTestCases:android.app.appsearch.cts.app.GlobalSearchSessionCtsTest#testAddObserver_schemaChange_removed (repeatedly)
Bug: 193494000
Bug: 218898037
Change-Id: I6276ae079866186bd4ff91ad723c959aaa4efc49
1 file changed