Support for changing density of DrawableWrapper subclasses

Includes a refactoring of DrawableWrapper classes so that the wrapper
super class handles both drawable management and inflation. This allows
us to immediately call through to super() in inflate and applyTheme,
which simplifies density management.

Bug: 25081461
Change-Id: I8c157d340fd1f28a3a2b786c56850a67cdd452e4
8 files changed