23963 Pass sampling rather than rely on (deprecated) filter-quality (cla: yes, waiting for tree to go green)

23964 Roll Skia from 798021ada347 to 0ecfdea19978 (10 revisions) (cla: yes, waiting for tree to go green)

23965 [web] Fix alignment issue in rich paragraphs (cla: yes, platform-web, waiting for tree to go green)

23966 Roll Dart SDK from 15dfe858c4a6 to 89cd39c6eee4 (1 revision) (cla: yes, waiting for tree to go green)

23967 [macos] Make metal the default rendering backend on macOS >= 10.14 (cla: yes, waiting for tree to go green)