[Clank] Add JNI interface for media persistent license storage

media/base/android/media_drm_storage_bridge.h

Index: media/base/android/media_drm_storage_bridge.h
diff --git a/media/base/android/media_drm_storage_bridge.h b/media/base/android/media_drm_storage_bridge.h
new file mode 100644
index 0000000000000000000000000000000000000000..b20e3285e1b54e47200b89a44ba41af1fb70baac
--- /dev/null
+++ b/media/base/android/media_drm_storage_bridge.h
@@ -0,0 +1,71 @@
+// 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.
+
+#ifndef MEDIA_BASE_ANDROID_MEDIA_DRM_STORAGE_BRIDGE_H_
+#define MEDIA_BASE_ANDROID_MEDIA_DRM_STORAGE_BRIDGE_H_
+
+#include <jni.h>
+#include <memory>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace media {
+
+class MediaDrmStorageBridge {
+ public:
+  static bool RegisterMediaDrmStorageBridge(JNIEnv* env);
+
+  MediaDrmStorageBridge();
+  ~MediaDrmStorageBridge() = default;
+
+  // The following OnXXX functions are called by Java. The functions will post
+  // task on message loop immediately to avoid reentrancy issues.
+
+  // Called by the java object when persistent storage should be initialized.
+  // Record the time as provisioning time.
+  void OnInitStorage(JNIEnv* env,

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

I see why you call it "Init", since this is the first time we add an entry into
the storage for the "origin". But this is a bit confusing since MediaDrm
shouldn't care about the impl detail of the storage.

Can we rename it to OnProvisioned to be consistent with the MediaDrmStorage
interface?

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

Done.

+                     const base::android::JavaParamRef<jobject>& j_storage,
+                     // Callback<Boolean>
+                     const base::android::JavaParamRef<jobject>& j_callback);
+
+  // Called by the java object to load session data into memory. |j_callback|
+  // will return a null object if load fails.
+  void OnLoadInfo(JNIEnv* env,
+                  const base::android::JavaParamRef<jobject>& j_storage,
+                  const base::android::JavaParamRef<jbyteArray>& j_session_id,
+                  // Callback<PersistentInfo>
+                  const base::android::JavaParamRef<jobject>& j_callback);
+
+  // Called by the java object to persistent session data.
+  void OnSaveInfo(JNIEnv* env,
+                  const base::android::JavaParamRef<jobject>& j_storage,
+                  // PersistentInfo
+                  const base::android::JavaParamRef<jobject>& j_persist_info,
+                  // Callback<Boolean>
+                  const base::android::JavaParamRef<jobject>& j_callback);
+
+  // Called by the java object to remove persistent session data.
+  void OnClearInfo(JNIEnv* env,
+                   const base::android::JavaParamRef<jobject>& j_storage,
+                   const base::android::JavaParamRef<jbyteArray>& j_session_id,
+                   // Callback<Boolean>
+                   const base::android::JavaParamRef<jobject>& j_callback);
+
+ private:
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+
+  // NOTE: Weak pointers must be invalidated before all other member variables.
+  base::WeakPtrFactory<MediaDrmStorageBridge> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaDrmStorageBridge);
+};
+
+}  // namespace media
+#endif  // MEDIA_BASE_ANDROID_MEDIA_DRM_STORAGE_BRIDGE_H_