Resolve some differences between CSSNode and CSSNodeJNI

Summary: This diff resolves some differences in behaviour between jni and java css nodes. This ensures certain test cases pass with both implementations.

Reviewed By: lucasr

Differential Revision: D3960755

fbshipit-source-id: 3e13a9435208851a96a619c07625ef2a5402f5ec

java/com/facebook/csslayout/CSSNode.java

@@ -649,5 +649,6 @@ public class CSSNode implements CSSNodeAPI<CSSNode> {
     layout.resetResult();
     lineIndex = 0;
     mLayoutState = LayoutState.DIRTY;
+    mMeasureFunction = null;
   }
 }