Bug 971556 - [System2] Instantiable SourceView.
Bug 971512 - [System] Instantiable layout manager
Merge remote-tracking branch 'upstream/master' into bubble-tea
Merge pull request #16592 from rexboy7/system-bug971512-bubbletea

Bug 971512 - [System] Instantiable layout manager. r=alive
Merge pull request #16603 from desaintmartin/971556_system2_sourceview-bubble-tea

Bug 971556 - [System2] Instantiable SourceView (bubble-tea).
Merge remote-tracking branch 'b2g/master' into bubble-tea
Bug 970028 - Nicer activity opener animation
Merge pull request #16650 from alivedise/bugzilla/970028_bubble-tea/nicer-activity-caller-open-animation

Bug 970028 - Nicer activity opener animation, r=timdream
Bug 971498 - [System2] Instantiable HomescreenLauncher