21702 [web] Reland Support custom url strategies (cla: yes, platform-web)

21852 Auto detect mode to determine which rendering backend to use. (cla: yes, platform-web, waiting for tree to go green)

21856 Fixing semantics borders on mobile web (cla: yes, platform-web)

21873 [web] Implement sweep gradient (cla: yes, platform-web)

21928 [web] Fix scroll wheel line delta on Firefox. (cla: yes, platform-web)

22070 [web] Fix positioning of canvas elements due to svg filters (cla: yes, platform-web)

22085 Implement Scene.toImage() in CanvasKit mode. (cla: yes, platform-web)