Change the ColorFilter constructor to ColorFilter.Mode, in case we want to add

sky/examples/game/lib/sprite_node.dart

 part of sprites;
 
 // TODO: Actually draw images
 
 class SpriteNode extends TransformNode {
   
   Image _image;
   bool constrainProportions = false;
   double _opacity = 1.0;
   Color colorOverlay;
@@ skipping 34 matching lines @@
           scaleX = scaleY;
         }
       }
       
       canvas.scale(scaleX, scaleY);
 
       // Setup paint object for opacity and transfer mode
       Paint paint = new Paint();
       paint.setARGB((255.0*_opacity).toInt(), 255, 255, 255);
       if (colorOverlay != null) {
-        paint.setColorFilter(new ColorFilter(colorOverlay, TransferMode.srcATopMode));
+        paint.setColorFilter(new ColorFilter.Mode(colorOverlay, TransferMode.srcATopMode));
       }
       if (transferMode != null) {
         paint.setTransferMode(transferMode);
       }
 
       canvas.drawImage(_image, 0.0, 0.0, paint);
       canvas.restore();
     }
     else {
       // Paint a red square for missing texture
       canvas.drawRect(new Rect.fromLTRB(0.0, 0.0, this.width, this.height),
           new Paint()..setARGB(255, 255, 0, 0));
     }
   }
   
-}
+}