Add style direction getter to CSSNode

src/java/src/com/facebook/csslayout/CSSNode.java

@@ -368,6 +368,13 @@ public class CSSNode {
     return style.height;
   }
 
+  /**
+   * Get this node's direction, as defined in the style.
+   */
+  public CSSDirection getStyleDirection() {
+    return style.direction;
+  }
+
   /**
    * Set a default padding (left/top/right/bottom) for this node.
    */