28345 organize snapshot/BUILD.gn targets and fix create_arm_gen_snapshot (cla: yes, waiting for tree to go green)

28347 Roll Dart SDK from 654a078603ea to 87900c1affc8 (1 revision) (cla: yes, waiting for tree to go green)

28348 [canvaskit] Implement invertColors (cla: yes, platform-web)

28349 Roll Skia from c26cf6c2f589 to c7774a779fac (4 revisions) (cla: yes, waiting for tree to go green)

28350 Roll Skia from c7774a779fac to 7bd3f1cc7822 (1 revision) (cla: yes, waiting for tree to go green)