9698 Ensure that platform messages without response handles can be dispatched. (cla: yes)

9707 Revert “Revert “Use track-widget-creation transformer included in the… (cla: yes)

9708 Roll src/third_party/dart b5aeaa6796…966038ef58 (cla: yes)

9711 Revert “Roll src/third_party/dart b5aeaa6796…966038ef58” (cla: yes)

9713 Explain why OpacityLayer has an offset field (cla: yes)

9716 Roll src/third_party/dart b5aeaa6796..06c3d7ad3a (44 commits) (cla: yes)