Created new BlendMode enum that maps to XferModes with additional
supported native values that map to SkBlendMode constants
Created new BlendModeColorFilter
Deprecated PorterDuffColorMode and PorterDuffColorFilter in
favor of BlendMode and BlendModeColorFilter.
Updated Paint API to use setBlendMode and deprecated setXfermode
Bug: 119671925
Bug: 112166079
Bug: 73224934
Test: Added CTS tests for BlendMode and BlendModeColorFilter
Change-Id: Idd50e2f0b81975c5ecf6f1c0edd4eb68198d9131
55e49d8816