22598 Replace support libraries for AndroidX (cla: yes, platform-android, waiting for tree to go green)

22599 Rename padding->viewPadding to match framework naming conventions (cla: yes, platform-android, waiting for tree to go green)

22602 Roll Fuchsia Linux SDK from cwFOtNvhn… to aAb3NJv_h… (cla: yes, waiting for tree to go green)

22604 Roll Fuchsia Mac SDK from aqxbkh0hC… to DQpWjEN59… (cla: yes, waiting for tree to go green)

22615 Roll Dart SDK from 061817652723 to 12fded61a2bc (12 revisions) (cla: yes, waiting for tree to go green)