Restore getIntrinsicWidth behavior from Android O

Updated ImageDecoder InputStreamSource to always respect the given
inputDensity regardless if the provided resource class is null
or not.

Fixes: 115836404
Test: AI8dcdc764a963e95d6c0ad644a1e05f055c748c75 Added CTS test to
verify intrinsic bounds of resolved Drawable respects display density

Change-Id: I54e5835a8bceea9c991972ff7f106dbed29b6662