Bug 858742 - Part 0: Add DBHelpers, FakeProfileTestCase, DBProviderTestCase.
Bug 858742 - Part 1: database-backed storage for Firefox Health Report on Android.
Bug 858742 - Part 2: provide a storage executor with appropriate log setup.
Bug 858742 - Part 3: ContentProvider to wrap FHR storage.
Bug 858742 - Part 4: FHR document generator.
Bug 858742 - Part 5: add preprocessed HealthReportConstants.java.
Bug 858742 - Part 6: flesh out HealthReportConstants.
Bug 858742 - Part 7: add manifest entry for FHR ContentProvider.
Bug 858742 - Storage for Firefox Health Report on Android. r=nalexander