Add getters to ol.style.Fill

src/ol/render/canvas/canvasimmediate.js

@@ -378,8 +378,9 @@ ol.render.canvas.Immediate.prototype.setFillStrokeStyle =
     function(fillStyle, strokeStyle) {
   var state = this.state_;
   if (!goog.isNull(fillStyle)) {
-    state.fillStyle = ol.color.asString(!goog.isNull(fillStyle.color) ?
+    var fillStyleColor = fillStyle.getColor();
-        fillStyle.color : ol.render.canvas.defaultFillStyle);
+    state.fillStyle = ol.color.asString(!goog.isNull(fillStyleColor) ?
+        fillStyleColor : ol.render.canvas.defaultFillStyle);
   } else {
     state.fillStyle = undefined;
   }

src/ol/render/canvas/canvasreplay.js

@@ -1027,8 +1027,9 @@ ol.render.canvas.PolygonReplay.prototype.setFillStrokeStyle =
   goog.asserts.assert(!goog.isNull(fillStyle) || !goog.isNull(strokeStyle));
   var state = this.state_;
   if (!goog.isNull(fillStyle)) {
-    state.fillStyle = ol.color.asString(!goog.isNull(fillStyle.color) ?
+    var fillStyleColor = fillStyle.getColor();
-        fillStyle.color : ol.render.canvas.defaultFillStyle);
+    state.fillStyle = ol.color.asString(!goog.isNull(fillStyleColor) ?
+        fillStyleColor : ol.render.canvas.defaultFillStyle);
   } else {
     state.fillStyle = undefined;
   }

src/ol/style/circlestyle.js

@@ -127,7 +127,7 @@ ol.style.Circle.prototype.render_ = function() {
   context.arc(size / 2, size / 2, this.radius_, 0, 2 * Math.PI, true);
 
   if (!goog.isNull(this.fill_)) {
-    context.fillStyle = ol.color.asString(this.fill_.color);
+    context.fillStyle = ol.color.asString(this.fill_.getColor());
     context.fill();
   }
   if (!goog.isNull(this.stroke_)) {

src/ol/style/fillstyle.js

@@ -13,7 +13,16 @@ ol.style.Fill = function(opt_options) {
   var options = goog.isDef(opt_options) ? opt_options : {};
 
   /**
+   * @private
    * @type {ol.Color|string}
    */
-  this.color = goog.isDef(options.color) ? options.color : null;
+  this.color_ = goog.isDef(options.color) ? options.color : null;
+};
+
+
+/**
+ * @return {ol.Color|string} Color.
+ */
+ol.style.Fill.prototype.getColor = function() {
+  return this.color_;
 };