Set up Yoga experiment

Reviewed By: priteshrnandgaonkar

Differential Revision: D9943869

fbshipit-source-id: 6b6550f453ab4e0ab8305401b299f2d0ed415f72

java/com/facebook/yoga/YogaJNI.java

@@ -10,6 +10,10 @@ package com.facebook.yoga;
 import com.facebook.soloader.SoLoader;
 
 public class YogaJNI {
+
+  // Known constants. 1-3 used in previous experiments. Do not reuse.
+  public static int JNI_FAST_CALLS = 4;
+
   // set before loading any other Yoga code
   public static boolean useFastCall = false;