69535 AdoptAWidget: Dismissible (adopt a widget, cla: yes, framework, waiting for tree to go green)

69539  AdoptAWidget: PreferredSizeWidget (cla: yes, framework)

69547 [flutter_tools] remove unused or no longer useful code (cla: yes, tool, waiting for tree to go green)

69548 [flutter_tools] remove globals from android_workflow (cla: yes, tool)

69549 [flutter_tool] initialize flutter root in executable (cla: yes, team, tool)

69550 [flutter_tools] add canvaskit hot reload integration test (cla: yes, tool)

69555 AdoptAWidget: SnackBar (cla: yes, f: material design, framework, waiting for tree to go green)