create global ref properly in YogaJNIException

Summary:
##Changelog:
[Internal][Yoga] create global ref properly in YogaJNIException

Reviewed By: astreet

Differential Revision: D18775982

fbshipit-source-id: ee529d6178d40b5f887fa1327fe156fa466f154f

java/jni/common.h

@@ -69,6 +69,8 @@ callStaticObjectMethod(JNIEnv* env, jclass clazz, jmethodID methodId, ...);
  * reference out of it. If any error happens, aborts the process.
  */
 ScopedGlobalRef<jobject> newGlobalRef(JNIEnv* env, jobject obj);
+
+ScopedGlobalRef<jthrowable> newGlobalRef(JNIEnv* env, jthrowable obj);
 } // namespace vanillajni
 } // namespace yoga
 } // namespace facebook