27353 [fuchsia] Use FFI to get System clockMonotonic (cla: yes, waiting for tree to go green, platform-fuchsia, needs tests)

27354 Ensure gclient sync is successful on an M1 Mac host. (cla: yes, waiting for tree to go green, platform-macos)

27355 Roll Dart SDK from fb3ebe02a0bb to 2b81a20ef985 (8 revisions) (cla: yes, waiting for tree to go green)

27358 Revert “Build rules for scenario_app” (cla: yes)

27360 Reland build rules for scenario app (cla: yes)

27361 [web] Fix webkit ColorFilter.mode for webkit (cla: yes, platform-web)

27362 NNBD migration for scenario_app (cla: yes)