9638 Reland: Roll Dart to 67ab3be10d35d994641da167cc806f20a7ffa679 (cla: yes)

9640 make EmbeddedViewParams a unique ptr (cla: yes)

9641 Let pushColorFilter accept all types of ColorFilters (cla: yes)

9642 Fix warning about settings unavailable GN arg build_glfw_shell (cla: yes)

9649 Roll buildroot to c5a493b25. (cla: yes)

9651 Move the mutators stack handling to preroll (cla: yes)

9652 Pipeline allows continuations that can produce to front (cla: yes)

9653 External view embedder can tell if embedded views have mutated (cla: yes)