22348 Rasterizer is initialized with an external view embedder (cla: yes)

22349 Roll Skia from 05f74f28d688 to 6cafdc069bdb (1 revision) (cla: yes, waiting for tree to go green)

22350 Roll Dart SDK from 1936a7d1909d to fe12b0536f42 (1 revision) (cla: yes, waiting for tree to go green)

22352 Roll Skia from 6cafdc069bdb to ba9a04fb8d5a (3 revisions) (cla: yes, waiting for tree to go green)

22353 PlatformViewIOS CreateExternalViewEmbedder refactor (cla: yes, platform-android, platform-ios)