47856 Revert “Roll engine dc0187f21777..69e41497404d (6 commits) (#47847)” (cla: yes, engine)

47875 Add many more global analyses. (a: accessibility, cla: yes, d: examples, f: material design, framework, team, team: gallery, tool)

47884 add key to constructors of public widgets (cla: yes, f: cupertino, f: material design, framework)

47888 Revert “fix duration event of timeline summary (#47742)” (a: tests, cla: yes, framework)

47889 Reland “fix duration event of timeline summary (#47742)” (a: tests, cla: yes, framework)