18831 Reset AndroidExternalViewEmbedder state when starting a new frame (cla: yes, platform-android, waiting for tree to go green)

18833 [fuchsia] Limit unnecessary layout transition to aarch64. (cla: yes)

18835 Roll Skia from 024d42fdd6bb to cdc39bda9237 (19 revisions) (cla: yes, waiting for tree to go green)

18836 Roll Dart SDK from f92a7d2669b1 to 62903873df30 (10 revisions) (cla: yes, waiting for tree to go green)

18837 Fix braces style (cla: yes)

18838 Avoid creating a vector when constructing Dart typed data objects for platform messages (cla: yes, perf: speed, severe: performance, waiting for tree to go green)