50363 Roll engine f3ce90e9387b..580503c35926 (24 commits) (cla: yes, waiting for tree to go green)

50365 Switch flutter_tools to use frontend_server for web compilation (cla: yes, team, tool, waiting for tree to go green)

50366 Fix Dropdown 'itemHeights' was called on null crash (cla: yes, customer: crowd, f: material design, framework, severe: crash, waiting for tree to go green)

50367 Disable tests using gauge (cla: yes, team)

50368 change quote to avoid escapes (a: accessibility, a: internationalization, a: tests, cla: yes, d: examples, f: cupertino, f: material design, framework, team, team: gallery, tool)