24853 Roll Fuchsia Mac SDK from Ler-DhxPF… to Rw36pWO5J… (cla: yes, waiting for tree to go green)

24855 Roll Fuchsia Linux SDK from -kU3jhhRL… to hnDJ6SZhJ… (cla: yes, waiting for tree to go green)

24856 Roll Skia from 5f2932e0e391 to 07ee548d5bcd (1 revision) (cla: yes, waiting for tree to go green)

24860 Roll Dart SDK from b191fb71063c to 64a5583ffbc9 (2 revisions) (cla: yes, waiting for tree to go green)

24861 Windows: Switch UWP build to using winrt generated headers (cla: yes)