21571 Roll Fuchsia Mac SDK from gZ122oeKO… to 1i9GaCxm8… (cla: yes, waiting for tree to go green)

21574 Roll Dart SDK from 9c89ce329247 to 2eab25e4b239 (1 revision) (cla: yes, waiting for tree to go green)

21576 Hookup view connected/disconnected events for platform view codepath (cla: yes)

21577 Roll Dart SDK from 2eab25e4b239 to 9f810fa15a9e (1 revision) (cla: yes, waiting for tree to go green)

21578 Use absolute path in ios_test_flutter target (cla: yes, platform-ios, waiting for tree to go green)