63817 Fix some doc typo (a: tests, cla: yes, framework, waiting for tree to go green)

63835 add vsync overhead to FrameTimingSummarizer (a: tests, cla: yes, framework, waiting for tree to go green)

63924 Remove TODOs added for HTTP abort() change in dart sdk (a: tests, cla: yes, framework, tool)

63972 Revert “Remove TODOs added for HTTP abort() change in dart sdk” (a: tests, cla: yes, framework, tool)

64021 Use real flutter root for finding pub in command integration test (a: tests, cla: yes, tool)

64258 update TimelineStream in flutter_driver (a: tests, cla: yes, framework, waiting for tree to go green)