25638 Roll Skia from 163ba10ddefa to 9d4741370cf1 (1 revision) (cla: yes, waiting for tree to go green)

25640 Roll Skia from 9d4741370cf1 to be82005209c0 (1 revision) (cla: yes, waiting for tree to go green)

25644 Wire up Metal shader precompilation from offline training runs. (cla: yes, waiting for tree to go green)

25646 Remove if from lerp.dart docs (cla: yes, waiting for tree to go green)

25648 Roll Skia from be82005209c0 to 59f1a9cb7a34 (5 revisions) (cla: yes, waiting for tree to go green)