81221 Enable vm:notify-debugger-on-exception for more use cases enabled by upstream fix (tool, framework, cla: yes)

81226 Revert “Migrate to ChannelBuffers.push” (a: tests, team, framework, f: material design, a: accessibility, cla: yes, f: cupertino, d: examples)

81228 Support notched BottomAppbar when Scaffold.bottomNavigationBar == null (framework, f: material design, cla: yes)

81235 Migrate to ChannelBuffers.push (a: tests, team, framework, f: material design, a: accessibility, cla: yes, f: cupertino, d: examples, waiting for tree to go green)

81240 Add benchmark for number of GCs in animated GIF (a: tests, team, framework, cla: yes, waiting for tree to go green)