Simplify TransferMode and Color types.

sky/engine/core/painting/Paint.h

Index: sky/engine/core/painting/Paint.h
diff --git a/sky/engine/core/painting/Paint.h b/sky/engine/core/painting/Paint.h
index a8af3cac141b6192529dfbee68c4a700bb292546..402080a1a85220d5dc8b5d233219e328a9ba0b25 100644
--- a/sky/engine/core/painting/Paint.h
+++ b/sky/engine/core/painting/Paint.h
@@ -29,9 +29,8 @@ public:
     bool isAntiAlias() const { return m_paint.isAntiAlias(); }
     void setIsAntiAlias(bool value) { m_paint.setAntiAlias(value); }
 
-    unsigned color() const { return m_paint.getColor(); }
-    void setColor(unsigned color) { m_paint.setColor(color); }
-    void setColor(CanvasColor color) { m_paint.setColor(color.sk_color); }
+    SkColor color() const { return m_paint.getColor(); }
+    void setColor(SkColor color) { m_paint.setColor(color); }
 
     void setARGB(unsigned a, unsigned r, unsigned g, unsigned b)
     {