21434 Roll Fuchsia Mac SDK from _e0onA6gY… to SUSVNJcX5… (cla: yes, waiting for tree to go green)

21435 Roll Skia from 5648572f4a94 to eabce08bb2f2 (1 revision) (cla: yes, waiting for tree to go green)

21436 Allow hot reload without syncing all asset files to devFS (cla: yes)

21437 Roll Dart SDK from 200e8da5072a to c938793e2d6f (1 revision) (cla: yes, waiting for tree to go green)

21438 Respect the –debug option in Firefox (cla: yes, platform-web, waiting for tree to go green)