21107 Fix a AppLifecycleTest present time race between the animation and the rest of the test (cla: yes, platform-ios, waiting for tree to go green)

21109 Fix erroneous dartdoc @tool directive. (cla: yes, waiting for tree to go green)

21121 Roll Fuchsia Linux SDK from XIejclW2X… to f3YqG3OdI… (cla: yes, waiting for tree to go green)

21122 Roll Skia from 6518d77a2200 to 9eb848ae8218 (20 revisions) (cla: yes, waiting for tree to go green)

21124 Roll Skia from 9eb848ae8218 to 582c5a9a84ac (1 revision) (cla: yes, waiting for tree to go green)