26540 Revert “Add support for compositing using Metal on macOS” (cla: yes, platform-macos)

26541 Roll Skia from d51fbe1a78b5 to 2e76c84b8b8a (9 revisions) (cla: yes, waiting for tree to go green)

26542 Guard task queue id for fuchsia (cla: yes)

26544 Roll Fuchsia Mac SDK from mDjEP9hR9… to pCoQB3Wr-… (cla: yes, waiting for tree to go green)

26545 Roll Dart SDK from 4ce8bbf4738d to 47e55d2e746a (3 revisions) (cla: yes, waiting for tree to go green)