28576 Call _isLoopback as a last resort (cla: yes, waiting for tree to go green, needs tests)

28577 Roll Skia from 2e4dc863da04 to 56efcf2d5bc1 (5 revisions) (cla: yes, waiting for tree to go green)

28580 Roll Skia from 56efcf2d5bc1 to ec7b63a74585 (4 revisions) (cla: yes, waiting for tree to go green)

28581 Reland “RTM must to acquire lock before called IsMergedUnsafe (#28514)” (cla: yes, needs tests)

28582 Roll Dart SDK from 86bd94a5b8dd to 904ca10d48a7 (1 revision) (cla: yes, waiting for tree to go green)