14351 [fuchsia] Move async_get_default_dispatcher include to the header (cla: yes)

14359 Assert that arc end caps on canvases with root surface transformations are drawn correctly. (cla: yes)

14361 [tests] Use distinct begin and end times (cla: yes)

14367 objcdoc fix for some ambiguity (cla: yes, waiting for tree to go green)

14375 Roll src/third_party/skia 3517aa7b14ad..826484f2631f (18 commits) (autoroller: commit, cla: yes)

14378 [Web] Fix pointer binding  (cla: yes, platform-web)