Expose alignContent to java

Summary: Expose already existing alignContent property to java

Reviewed By: IanChilds

Differential Revision: D3709071

fbshipit-source-id: 421d75924ecc12d6d0975e342f3862cf5592f65f

java/com/facebook/csslayout/CSSNode.java

@@ -319,6 +319,19 @@ public class CSSNode implements CSSNodeAPI<CSSNode> {
     }
   }
 
+  @Override
+  public CSSAlign getAlignContent() {
+    return style.alignContent;
+  }
+
+  @Override
+  public void setAlignContent(CSSAlign alignContent) {
+    if (style.alignContent != alignContent) {
+      style.alignContent = alignContent;
+      dirty();
+    }
+  }
+
   /**
    * Get this node's position type, as defined by style.
    */