29766 maybeGetInitialRouteFromIntent: check if URI data getPath() is null (platform-android, cla: yes, waiting for tree to go green, needs tests)

29770 Roll Skia from 686ccec13fc5 to 2211c2c4bd69 (25 revisions) (cla: yes, waiting for tree to go green)

29771 Fixes the accessibilityContainer of FlutterScrollableSemanticsObject (platform-ios, cla: yes, waiting for tree to go green)

29774 Roll Dart SDK from 46934d8475ff to 6e6558437a09 (4 revisions) (cla: yes, waiting for tree to go green)

29775 Opacity peephole optimization (platform-ios, platform-android, cla: yes, waiting for tree to go green, needs tests, embedder)