1. Notification panel on tablet does not handle back and home key events and
as a result the notification panel stays open. Hence, after opening the
notifications panel, pressing the back key on a keyboard will move back
in the app instead closing the panel. Same happens for the home key.
The expected behavior is if the panel is open the back button will dismiss
it and the key should be consumed by the panel. The home key should hide
the panel and the key should not be consumed by the panel so the system
can do the right thing.
bug:6902903
Change-Id: I06e8ceea1f51b998e6703d70dcb3a24128d5a581
73b9c29b8b