24992 Roll Dart SDK from ce9e3535ae16 to b7e02a713eab (2 revisions) (cla: yes, waiting for tree to go green)

24993 Roll Skia from 7854da39b3c1 to 4fb13e026b6b (20 revisions) (cla: yes, waiting for tree to go green)

24995 [macos] [metal] Fix use after free in FlutterExternalTextureMetal (cla: yes)

24997 Roll Fuchsia Mac SDK from xOxFrRRO6… to pmsuWkRQA… (cla: yes, waiting for tree to go green)

24999 Implement AXPlatformNodeBase::GetInstanceCountForTesting (cla: yes, waiting for tree to go green)