18981 Make sure the native callback is registered before running the test. (cla: yes)

18982 Roll Fuchsia Mac SDK from oWhyp… to gAD3P… (cla: yes, waiting for tree to go green)

18983 Roll Skia from 9c401e7e1ace to f69e40841eb9 (11 revisions) (cla: yes, waiting for tree to go green)

18985 Call destructor and fix check (cla: yes, platform-android)

18987 Roll Dart SDK from 0fab083e1c2b to e62b89c56d01 (10 revisions) (cla: yes, waiting for tree to go green)

18988 Fix shift-tab not working by adding more GTK->GLFW key mappings. (cla: yes)