Leanback: fix bad dim support of new details UI.

The current code has bug that being revealed on mnc.
Need extra FrameLayout to apply dim foreground before
mnc.  The code is copied from the old details UI.

b/21205552

Change-Id: Ibb77e70f1329f039d8fdf9f4af4d8afb63076fe3
2 files changed