base

Fix several small layout and color issues

Adjusts switch track asset for consistent alignment across DPI buckets,
adjusts edit text background. Lightens the "Light" theme action bar
color so that it doesn't blend in with the action bar shadow.

BUG: 18430444
BUG: 18356558
BUG: 18390994
Change-Id: I1d1e26239fa0c921a65e4ec8b5df0b0093b3989c