29629 Use -linkoffline to provide the Android Javadoc package list (platform-android, cla: yes, waiting for tree to go green)

29630 Specify the output paths of the android_background_image lint task (cla: yes, waiting for tree to go green)

29631 Roll Dart SDK from 38e7078fa2b7 to e9488dd50ffb (12 revisions) (cla: yes, waiting for tree to go green)

29633 Exit with failure code if clang-tidy finds linter issues (cla: yes, waiting for tree to go green, needs tests)

29634 [fuchsia] Point TODOs off closed bug. (cla: yes, waiting for tree to go green, platform-fuchsia, needs tests)