media: Add MediaDrmStorage

media/mojo/interfaces/media_drm_storage.mojom

+// 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.
+
+module media.mojom;
+
+import "url/mojo/origin.mojom";
+
+// An interface to store ....????? for CDM. This includes Android
+// MediaDrm. See Android documentation about MediaDrm:
+// https://developer.android.com/reference/android/media/MediaDrm.html
+
+// TODO(xhwang): Use a struct for PersistentSessionInfo.
+
+interface MediaDrmStorage {
+  // Initializes |this| to be bound to the |origin|. This should not modify
+  // anything in the storage.
+  Initialize(url.mojom.Origin origin);
+
+  // Saves |origin| in the storage after MediaDrm is provisioned for |origin|.
+  OnProvisioned() => (bool success);
+
+  // Saves persistent session data for |session_id|.
+  SavePersistentSession(
+    string session_id, array<uint8> key_set_id, string mime_type)
+    => (bool success);
+    
+  LoadPersistentSession(string session_id)
+    => (bool success, array<uint8>? key_set_id, string? mime_type);
+
+  // Removes the persistent session info for |session_id| from the storage.
+  RemovePersistentSession(string session_id) => (bool success);
+};