RTL labels now work in constructor

Adjusted the text position and used its setter in order to construct the Label
Adjusted tests accordinglt

Source/Scene/Label.js

@@ -87,8 +87,6 @@ define([
             throw new DeveloperError('disableDepthTestDistance must be greater than 0.0.');
         }
         //>>includeEnd('debug');
-
-        this._text = defaultValue(options.text, '');
         this._show = defaultValue(options.show, true);
         this._font = defaultValue(options.font, '30px sans-serif');
         this._fillColor = Color.clone(defaultValue(options.fillColor, Color.WHITE));
@@ -111,7 +109,6 @@ define([
         this._heightReference = defaultValue(options.heightReference, HeightReference.NONE);
         this._distanceDisplayCondition = options.distanceDisplayCondition;
         this._disableDepthTestDistance = defaultValue(options.disableDepthTestDistance, 0.0);
-        this._rtl = defaultValue(options.rtl, false);
 
         this._labelCollection = labelCollection;
         this._glyphs = [];
@@ -126,6 +123,9 @@ define([
 
         this._clusterShow = true;
 
+        this._rtl = defaultValue(options.rtl, false);
+        this.text = defaultValue(options.text, '');
+
         this._updateClamping();
     }
 

Specs/Scene/LabelCollectionSpec.js

@@ -1867,9 +1867,10 @@ defineSuite([
         it('should reverse text when there is only hebrew characters and rtl is true', function() {
            var text = 'שלום';
            var label = labels.add({
-               text : text
+               text : text,
+               rtl: true
            });
-           label.rtl = true;
+
            scene.renderForSpecs();
 
            expect(label.rtl).toEqual(true);