Add the ability to attach data to a java CSSNode

Reviewed By: lucasr

Differential Revision: D3662065

fbshipit-source-id: 560a768092f17381e99b349d08bd4a8b365541be

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

@@ -63,6 +63,7 @@ public class CSSNode implements CSSNodeAPI<CSSNode> {
   private @Nullable MeasureFunction mMeasureFunction = null;
   private LayoutState mLayoutState = LayoutState.DIRTY;
   private boolean mIsTextNode = false;
+  private Object mData;
 
   @Override
   public void init() {
@@ -621,6 +622,16 @@ public class CSSNode implements CSSNodeAPI<CSSNode> {
     }
   }
 
+  @Override
+  public void setData(Object data) {
+    mData = data;
+  }
+
+  @Override
+  public Object getData() {
+    return mData;
+  }
+
   /**
    * Resets this instance to its default state. This method is meant to be used when
    * recycling {@link CSSNode} instances.