50831 Change Focus.unfocus to take a disposition for where the focus should go. (a: desktop, cla: yes, f: focus, f: routes, framework)

50835 Use Async WebDriver for WebFlutterDriver. (a: tests, cla: yes, framework, tool, waiting for tree to go green)

50840 Revert “[flutter_tools] More Linux version detail” (cla: yes, tool)

50841 Update Android activities because plugin registration is now done by FlutterActivity.configureFlutterEngine (cla: yes, d: examples, team, team: gallery, tool, waiting for tree to go green)

50842 Avoid including a potentially animated invisible image (a: images, cla: yes, framework, perf: memory, perf: speed, severe: performance)

50844 [flutter_tools] use uri resolution for asset requests (cla: yes, tool, waiting for tree to go green)