[Clank] Add JNI interface for media persistent license storage

media/base/android/android_util.h

+// Copyright (c) 2017 The Chromium Authors. All rights reserved.

[xhwang, 2017/03/30 23:33:42]

nit: here and everywhere else, drop the (c) part

[yucliu1, 2017/03/31 00:57:17]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <memory>
+#include <string>
+
+#include "base/android/scoped_java_ref.h"
+
+namespace media {
+
+using JavaObjectPtr =
+    std::unique_ptr<base::android::ScopedJavaGlobalRef<jobject>>;
+
+// Converts jbyteArray (byte[] in Java) into std::string.
+std::string JavaBytesToString(JNIEnv* env, jbyteArray j_byte_array);
+
+// A helper method to create a JavaObjectPtr.
+JavaObjectPtr CreateJavaObjectPtr(jobject object);
+
+}  // namespace media