26326 Roll Dart SDK from a70c4b0fafc2 to 1efa8657fe8e (2 revisions) (cla: yes, waiting for tree to go green)

26327 Roll Skia from 465819d7c20d to 0ea0e75a3d29 (6 revisions) (cla: yes, waiting for tree to go green)

26328 prevent ios accessibility bridge from sending notification when modal (platform-ios, cla: yes, waiting for tree to go green)

26331 android platform channels: moved to direct buffers for c <-> java interop (platform-android, cla: yes, waiting for tree to go green)

26334 Roll Dart SDK from 1efa8657fe8e to 1c14e29fbfba (1 revision) (cla: yes, waiting for tree to go green)