Bug 903531 - First copy of background JUnit 3 test suite. r=rnewman

The background test suite covers all the Android Background
Services, including Sync, Product Announcments, and Firefox Health
Report.  It is developed at

https://github.com/mozilla-services/android-sync
Bug 907755 - Added telemetry probes to measure how long it takes to display a selected source text to the user; r=fitzgen