[Clank] Add JNI interface for media persistent license storage

media/base/android/media_drm_storage_bridge.cc

+// Copyright (c) 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/media_drm_storage_bridge.h"
+
+#include <memory>
+
+#include "base/android/callback_android.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "jni/MediaDrmStorageBridge_jni.h"
+
+using base::android::JavaParamRef;
+using base::android::RunCallbackAndroid;
+using base::android::ScopedJavaLocalRef;
+
+namespace media {
+
+// static
+bool MediaDrmStorageBridge::RegisterMediaDrmStorageBridge(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+MediaDrmStorageBridge::MediaDrmStorageBridge()

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

Thoughts on the next CL: you can pass in the create_storage_cb_ here, and only
call it to create the MediaDrmStorage when we need it.

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

Just to confirm, we need to lazy create the storage only once per instance,
right?

[xhwang, 2017/03/31 03:47:57]

Yes, only once per instance.

+    : task_runner_(base::ThreadTaskRunnerHandle::Get()), weak_factory_(this) {}
+
+// TODO(yucliu): Implement these methods with MediaDrmStorage
+
+void MediaDrmStorageBridge::OnInitStorage(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& j_storage,
+    // Callback<Boolean>
+    const JavaParamRef<jobject>& j_callback) {
+  NOTIMPLEMENTED();
+
+  RunCallbackAndroid(j_callback, true);
+}
+
+void MediaDrmStorageBridge::OnLoadInfo(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& j_storage,
+    const JavaParamRef<jbyteArray>& j_session_id,
+    // Callback<PersistentInfo>
+    const JavaParamRef<jobject>& j_callback) {
+  NOTIMPLEMENTED();
+
+  RunCallbackAndroid(j_callback, ScopedJavaLocalRef<jobject>());
+}
+
+void MediaDrmStorageBridge::OnSaveInfo(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& j_storage,
+    const JavaParamRef<jobject>& j_persist_info,
+    // Callback<Boolean>
+    const JavaParamRef<jobject>& j_callback) {
+  NOTIMPLEMENTED();
+
+  RunCallbackAndroid(j_callback, false);
+}
+
+void MediaDrmStorageBridge::OnClearInfo(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& j_storage,
+    const JavaParamRef<jbyteArray>& j_session_id,
+    // Callback<Boolean>
+    const JavaParamRef<jobject>& j_callback) {
+  NOTIMPLEMENTED();
+
+  RunCallbackAndroid(j_callback, false);
+}
+}  // namespace media