91497 Refactor ThemeData  (framework, f: material design, cla: yes)

91498 Fixed a very small typo in code comments. (framework, f: scrolling, cla: yes, waiting for tree to go green)

91499 Add service extensions to expose debug rendering toggles (framework, cla: yes)

91506 Scrollbar shouldRepaint to respect the shape (framework, f: scrolling, cla: yes, waiting for tree to go green)

91527 Document why some lints aren’t enabled and fix some minor issues. (a: tests, team, tool, framework, cla: yes, waiting for tree to go green)