Make CardView respect the theme it is running in

Currently it's fixed in the light style, which results
in 'white' cards on when in a dark. This CL fixes this
in a reliable way so that we always sync with the theme.

BUG: 25765709
Change-Id: I9d7e92f9103b220c2000eb64093c9d39e4e3c923
3 files changed