Bug 893554 - Installation wizard should have a hook for 3rd party keyboard application exposing its layout selections
    - add 3rd-party install flow unit test
Merge pull request #11881 from mpizza/bug_893554_IMEwizard_master

Bug 893554 - Installation wizard should have a hook for 3rd party keyboa... . r=julien
Bug 909394 - [Clock] Implement Stopwatch view