21368 Roll Skia from 59b2a92c96ba to 1b89eb742a66 (5 revisions) (cla: yes, waiting for tree to go green)

21369 Roll Fuchsia Linux SDK from IWfLWIJ93… to -grWUcdOo… (cla: yes, waiting for tree to go green)

21370 fix EnginePicture.toImage; implement rawRgba toByteData; add test (cla: yes, platform-web, waiting for tree to go green)

21371 isCloneOf for Image (cla: yes, waiting for tree to go green)

21372 Fix for issue flutter/#66502. (cla: yes, platform-web)