18435 Roll src/third_party/skia 67c921abaac3..56cde4923f9f (3 commits) (cla: yes, waiting for tree to go green)

18436 null-annotate native calls in lib/ui/semantics.dart (cla: yes)

18437 [web] Reuse ImageElement(s) across frames (cla: yes)

18438 Roll src/third_party/dart 2d57c1f86e22..529f614eb381 (13 commits) (cla: yes, waiting for tree to go green)