7281 TextInputType.number default fix (cla: yes)

7282 Add elevation and thickness to SemanticsNode (accessibility, cla: yes)

7283 Revert “Roll Dart to version e15e8609aa8610f8c432f1caf2ab89358e2fce50” (cla: yes)

7284 Roll buildroot and update method of getting android SDK and support libs (cla: yes)

7286 Roll version of Dart to d1817ddc91fd3aea061647b2e21860c47a5a5180 (cla: yes)

7287 Paint all backgrounds first to prevent overlap (cla: yes)

7307 Only reject gestures to embedded UIViews when the framework says so. (cla: yes)