Add ShadowTimePickerDialog implementation to access initial time
Add test for ShadowTimePickerDialog
Merge pull request #927 from eugie/master

Add ShadowTimePickerDialog implementation to access initial time
Add ShadowPopupWindow.getLatestPopupWindow()
Add ShadowListPopupWindow and getLatestListPopupWindow()
Merge pull request #929 from pivotal-odell/getLatestPopupWindow

Added ShadowPopupWindow.getLatestPopupWindow()
Implement Context.getSystemService for MediaRouter.

Closes #933.
Implement Context.getSystemService for DisplayManager.

Closes #935.