Bug 938896 - Add some properties to MockLockScreen.
Bug 938896 - Add paused attribute to MockAudio.

Unlike playing, paused is defined at:
http://www.whatwg.org/specs/web-apps/current-work/#dom-media-paused
Bug 938896 - Make MockLock return a request on set().
Bug 938896 - Make MockSettingsURL actually set its value on set().
Bug 938896 - Add MockDeviceStorage.
Bug 938896 - Add MockGeolocation.
Bug 938896 - Add minimal MockPermissionSettings.
Bug 938905 - Add a message panel to the lock screen.
Bug 938901 - Add Find My Device app.
Bug 938898 - Integrate Find My Device into the Settings app.
Bug 938896 - Add a very simple test app for Find My Device.
Merge pull request #16325 from guilherme-pg/findmydevice

Bug 938896 - Find My Device