12728 Remove unused import in the scenario app (cla: yes)

12730 Stop setting the accessibility text if a node has SCOPES_ROUTE set. (cla: yes)

12732 Fix parameter naming in docs (cla: yes)

12733 [flutter_runner] Make rd and rx uniform (cla: yes)

12742 Revert “Revert “Update linux toolchain for fuchsia” (#12578)” (CQ+1, cla: yes)

12746 Send AccessibilityEvent.TYPE_VIEW_FOCUSED when input focus is set. (cla: yes)

12747 Add web implementation for channel_buffers.dart (cla: yes)

12752 Enabled people to chose if SystemNavigator.pop is animated on iOS. (cla: yes)