Fix progress bar tinting, add tint support to ShapeDrawable

Cleans up APIs a little, since I think we may want to add tinting
modes beyond what Porter-Duff can provide. Plus we don't actually
support some of the Porter-Duff modes in hardware.

Change-Id: I2cea1b737cc93607a24842c54eb9f0d8346b29d4
6 files changed