60658 [flutter_tools] fix crash if grouped doctor validator crashes (cla: yes, tool, waiting for tree to go green)

60659 Roll Engine from 2dc202d82388 to 712f619737f1 (3 revisions) (cla: yes, waiting for tree to go green)

60660 In layers_test create a canvas to start recording on the PictureRecorder (cla: yes, framework, waiting for tree to go green)

60668 Roll tester version (cla: yes, team)

60684 Enable shouldCapTextScaleForTitle by default in AppBarTheme (cla: yes, f: material design, framework, waiting for tree to go green)