23463 Roll Dart SDK from 996a58122821 to 9542c7bc569a (3 revisions) (cla: yes, waiting for tree to go green)

23464 Roll Skia from 417743f806d1 to a7b7964a237a (19 revisions) (cla: yes, waiting for tree to go green)

23471 update browser history switching (cla: yes, platform-web, waiting for tree to go green)

23472 Revert Dart roll (#23444) (cla: yes, waiting for tree to go green)

23474 Provide a runtime switch for selecting SkParagraph text layout (cla: yes, platform-android, platform-ios, waiting for tree to go green)