29889 Listen for Vsync callback on the UI thread directly (platform-android, cla: yes, waiting for tree to go green, needs tests)

29890 Roll Fuchsia Mac SDK from MiNhUYhfN… to WE4QO6Yjw… (cla: yes, waiting for tree to go green)

29891 Roll Fuchsia Linux SDK from hbyHcc_5x… to xW7v3nxI0… (cla: yes, waiting for tree to go green)

29894 Roll Skia from b59d6fe7f0b2 to 7f5b19bd6907 (10 revisions) (cla: yes, waiting for tree to go green)

29896 [web] merge the README files into one (cla: yes, platform-web)