Added UnguessableToken.java .

base/android/jni_unguessable_token.h

Index: base/android/jni_unguessable_token.h
diff --git a/base/android/jni_unguessable_token.h b/base/android/jni_unguessable_token.h
new file mode 100644
index 0000000000000000000000000000000000000000..f269888f8a6d7e6d9bf1db0f31683d0f0eceacd1
--- /dev/null
+++ b/base/android/jni_unguessable_token.h
@@ -0,0 +1,30 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_ANDROID_JNI_UNGUESSABLE_TOKEN_H_
+#define BASE_ANDROID_JNI_UNGUESSABLE_TOKEN_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/base_export.h"
+#include "base/unguessable_token.h"
+
+namespace base {
+namespace android {
+
+// Create a java UnguessableToken with the same value as |token|.
+BASE_EXPORT ScopedJavaLocalRef<jobject> CreateJavaUnguessableToken(
+    JNIEnv* env,
+    const base::UnguessableToken& token);
+
+// Create a native UnguessableToken from |token|.
+BASE_EXPORT base::UnguessableToken ConvertFromJavaUnguessableToken(
+    JNIEnv* env,
+    const JavaRef<jobject>& token);
+
+}  // namespace android
+}  // namespace base
+
+#endif  // BASE_ANDROID_JNI_UNGUESSABLE_TOKEN_H_