Themes: Pass ComposedIconInfo into createIconBitmap

The majority of the parameters being passed into createIconBitmap
were coming straight from the ComposedIconInfo so rather than pass
them in separately we just pass in the ComposedIconInfo object.
This will help prevent increasing the # of parameters as more
features are added to composed icons.

Change-Id: I6840db66a1369e0d75de4c662563b96dc58c34ab