Added UnguessableToken.java .

base/android/jni_unguessable_token_unittest.cc

+// 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.
+
+#include "base/android/jni_unguessable_token.h"
+
+#include "base/android/jni_android.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+namespace android {
+
+TEST(JniUnguessableToken, BasicCreateToken) {
+  JNIEnv* env = AttachCurrentThread();
+  uint64_t high = 0x1234567812345678;
+  uint64_t low = 0x0583503029282304;
+  base::UnguessableToken token = base::UnguessableToken::Deserialize(high, low);
+  ScopedJavaLocalRef<jobject> jtoken = CreateJavaUnguessableToken(env, token);
+  base::UnguessableToken result = ConvertFromJavaUnguessableToken(env, jtoken);
+
+  EXPECT_EQ(token, result);
+}
+
+}  // namespace android
+}  // namespace base