Add getters for CSSNode's style width and height

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

@@ -341,6 +341,20 @@ public class CSSNode {
     return style.padding;
   }
 
+  /**
+   * Get this node's width, as defined in the style.
+   */
+  public float getStyleWidth() {
+    return style.width;
+  }
+
+  /**
+   * Get this node's height, as defined in the style.
+   */
+  public float getStyleHeight() {
+    return style.height;
+  }
+
   /**
    * Set a default padding (left/top/right/bottom) for this node.
    */