18964 Roll Dart SDK from f40875bf1b68 to 2b917f5b6a0e (10 revisions) (cla: yes, waiting for tree to go green)

18965 Roll Skia from f7005498d416 to 9c401e7e1ace (7 revisions) (cla: yes, waiting for tree to go green)

18966 updated FlutterViewControllerTest tests names (cla: yes, platform-ios)

18969 [web] Provide a hook to disable location strategy (cla: yes, platform-web)

18971 Revert “Add RAII wrapper for EGLSurface” (cla: yes, platform-android)