fixed issue with x3d sphere diffuse color

The sphere was using the texture shader instead of the phong shader.
- added a constructor to GVRSphereSceneObject
- modify X3D parser to use Phong shader for sphere

GVRf/Framework/framework/src/main/java/org/gearvrf/scene_objects/GVRSphereSceneObject.java

@@ -81,20 +81,6 @@ public GVRSphereSceneObject(GVRContext gvrContext, boolean facingOut) {
                 new GVRMaterial(gvrContext), 1);
     }
 
-    /**
-     * Constructs a sphere scene object with a radius of 1 and 18 stacks, and 36
-     * slices.
-     *
-     * The sphere's triangles and normals are facing either in or out and the
-     * same texture will be applied to each side of the sphere.
-     *
-     * @param gvrContext
-     *            current {@link GVRContext}
-     *
-     * @param facingOut
-     *            whether the triangles and normals should be facing in or
-     *            facing out.
-     */
     /**
      * Constructs a sphere scene object 18 stacks, and 36
      * slices.
@@ -233,6 +219,35 @@ public GVRSphereSceneObject(GVRContext gvrContext, boolean facingOut,
                 material, 1);
     }
 
+    /**
+     * Constructs a sphere scene object with a radius of 1 and 18 stacks, and 36
+     * slices.
+     *
+     * The sphere's triangles and normals are facing either in or out and the
+     * same material will be applied to each side of the sphere.
+     *
+     * @param gvrContext
+     *            current {@link GVRContext}
+     *
+     * @param facingOut
+     *            whether the triangles and normals should be facing in or
+     *            facing out.
+     *
+     * @param material
+     *            the material for the sphere.
+     * @param radius
+     *          sets the sphere with the radius parameter.  Radius must be > 0
+     *          otherwise, set it to the default of 1
+     */
+    public GVRSphereSceneObject(GVRContext gvrContext, boolean facingOut,
+                                GVRMaterial material, float radius)
+    {
+        super(gvrContext);
+
+        generateSphereObject(gvrContext, STACK_NUMBER, SLICE_NUMBER, facingOut,
+                             material, radius);
+    }
+
     /**
      * Constructs a sphere scene object with a radius of 1 and user specified
      * stack and slice numbers.

GVRf/Framework/framework/src/main/java/org/gearvrf/x3d/X3Dobject.java

@@ -2612,7 +2612,7 @@ else if (qName.equalsIgnoreCase("Sphere")) {
                         solid = parseBooleanString(attributeValue);
                     }
                     GVRSphereSceneObject gvrSphereSceneObject = new GVRSphereSceneObject(
-                            gvrContext, solid, radius);
+                            gvrContext, solid, new GVRMaterial(gvrContext, GVRMaterial.GVRShaderType.Phong.ID), radius);
                     currentSceneObject.addChildObject(gvrSphereSceneObject);
                     meshAttachedSceneObject = gvrSphereSceneObject;