21779 Roll Skia from 9213e610ed92 to 840e8ea7403e (11 revisions) (cla: yes, waiting for tree to go green)

21782 Add missing ninja call to analyze.sh so it can be run locally easily (cla: yes, waiting for tree to go green)

21783 Roll Skia from 840e8ea7403e to ab6e62c131e9 (7 revisions) (cla: yes, waiting for tree to go green)

21789 [macOS] Add plumbing to grab dart entrypoint args (affects: desktop, cla: yes, needs tests, platform-macos, waiting for tree to go green)