29634 [fuchsia] Point TODOs off closed bug. (cla: yes, waiting for tree to go green, platform-fuchsia, needs tests)

29641 Remove outdated TODO (platform-android, cla: yes, needs tests)

29686 add trace events to cache sweeps (cla: yes, waiting for tree to go green, needs tests)

29741 Add ‘explicit’ to header files (platform-android, cla: yes, needs tests, embedder)

29766 maybeGetInitialRouteFromIntent: check if URI data getPath() is null (platform-android, cla: yes, waiting for tree to go green, needs tests)

29772 Roll to CanvasKit 0.31.0 (cla: yes, platform-web, needs tests)