Add the ability to attach data to a java CSSNode

Summary: The C version already has this ability via the same name 'context'. This can be used to attach arbitrary data about your view hierarchy to a CSSNode. Previously this could only be done in java via subclassing CSSNode.

Reviewed By: lucasr

Differential Revision: D3662065

fbshipit-source-id: 560a768092f17381e99b349d08bd4a8b365541be

java/com/facebook/csslayout/CSSNodeAPI.java

@@ -88,6 +88,8 @@ public interface CSSNodeAPI<CSSNodeType extends CSSNodeAPI> {
   void setDefaultPadding(int spacingType, float padding);
   CSSOverflow getOverflow();
   void setOverflow(CSSOverflow overflow);
+  void setData(Object data);
+  Object getData();
   void init();
   void reset();
 }