26734 Reverts default DragStartBehavior to DragStartBehavior.down (a: text input, cla: yes, f: cupertino, f: material design, f: scrolling, framework)

26736 [O] Removing all timeouts (mark II) (a: tests, cla: yes, framework, t: flutter driver, team, tool)

26737 Use Cirrus image’s fastlane instead of freezing our own set of gem dependencies (cla: yes, team, team: gallery)

26763 Close the Scaffold drawer in scroll_perf_test.dart (cla: yes, team)

26764 Fix lerp in textTheme to allow for null parameters (cla: yes, f: material design, framework)

26765 [Material] Inline the single Theme.of(context) call in BAB (cla: yes, f: material design, framework)