base

Fix launcher icon size for tvdpi.

We didn't have a case for tvdpi, so ended up in the default
scaling.  This resulting in us using 319 instead of 320.

Fixed the default case to round, and added explicit cases
for tvdpi since this is a standard density.

Change-Id: I752b924e1556af94682428c8c0ed7c75d15ac4a4