27378 Make the deviceDiscovery API overridable (cla: yes, tool)

27381 Fix bug in UnconstrainedBox class debugFillProperties (a: debugging, cla: yes, framework)

27387 Track InheritedElement dependencies in diagnostic properties (cla: yes, framework)

27389 Enable dependency injection of Window instead of using static property (cla: yes)

27399 Add elevation/pressElevation to ChipThemeData (cla: yes, f: material design, framework)

27400 Ensure Shrine app respects the platform toggle from Gallery options (cla: yes, team, team: gallery)

27409 Ensure all curves return 0 and 1 in .transform(t) when t=0/1 (a: animation, cla: yes, framework, waiting for tree to go green)