22762 Add support for scrollwheels (cla: yes, f: gestures, framework)

22810 build the gallery on PRs (cla: yes, team)

24476 Fix text selection handles showing outside the visible text region (a: text input, cla: yes, framework)

25164 Pan and zoom gallery demo (cla: yes, team, team: gallery)

25202 fix #19175 How should addTime be used from a test? (a: tests, cla: yes, framework, team: gallery, waiting for tree to go green)

26438 Breaks the moveBy call from drag and dragFrom into two separate calls and changes the default behavior of DragStartBehavior to DragStartBehavior.start (cla: yes, f: gestures, framework, severe: API break)