25779 Roll Dart SDK from d688c837d18f to ecdb943b5ed5 (1 revision) (cla: yes, waiting for tree to go green)

25780 Roll Dart SDK from ecdb943b5ed5 to 1e3e5efcd47e (1 revision) (cla: yes, waiting for tree to go green)

25781 Roll Skia from e6318b557a29 to 827dab407ec0 (1 revision) (cla: yes, waiting for tree to go green)

25785 [Engine] Support for Android Fullscreen Modes (platform-ios, platform-android, cla: yes, waiting for tree to go green, platform-fuchsia)