Add drawable tint support to CardView

Involves adding API 21 tint support to
RoundRectDrawable. Also implemented color filter
and alpha support (like the pre-v21 impl).

Also noticed that the pre-v21 shadow would uses any
given color filter which is incorrect. Shadows are always
the same realistic color.

BUG: 25250145
Change-Id: I3a30ef69c0b78a757a4fc20b0ae1a73e48ad00f3
2 files changed