[Clank] Add JNI interface for media persistent license storage

media/base/android/android_util.cc

+// Copyright 2017 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 "media/base/android/android_util.h"
+
+#include <stddef.h>
+#include <vector>
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_array.h"
+
+namespace media {
+
+std::string JavaBytesToString(JNIEnv* env, jbyteArray j_byte_array) {
+  std::vector<uint8_t> byte_vector;
+  base::android::JavaByteArrayToByteVector(env, j_byte_array, &byte_vector);
+  return std::string(byte_vector.begin(), byte_vector.end());
+}
+
+JavaObjectPtr CreateJavaObjectPtr(jobject object) {
+  JavaObjectPtr j_object_ptr(new base::android::ScopedJavaGlobalRef<jobject>());
+  j_object_ptr->Reset(base::android::AttachCurrentThread(), object);
+  return j_object_ptr;
+}
+
+}  // namespace media