[Clank] Implement MediaDrmStorageBridge with MediaDrmStorage

media/base/android/media_drm_storage.h

 // 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.
 
 #ifndef MEDIA_BASE_ANDROID_MEDIA_DRM_STORAGE_H_
 #define MEDIA_BASE_ANDROID_MEDIA_DRM_STORAGE_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "media/base/media_export.h"
 #include "url/origin.h"
 
 namespace media {
 
 // Allows MediaDrmBridge to store and retrieve persistent data. This is needed
 // for features like per-origin provisioning and persistent license support.
-class MEDIA_EXPORT MediaDrmStorage {
+class MEDIA_EXPORT MediaDrmStorage
+    : public base::SupportsWeakPtr<MediaDrmStorage> {
  public:
   struct SessionData {
     SessionData(std::vector<uint8_t> key_set_id, std::string mime_type);
+    SessionData(const SessionData& other);
     ~SessionData();
 
     std::vector<uint8_t> key_set_id;
     std::string mime_type;
   };
 
   MediaDrmStorage();
   virtual ~MediaDrmStorage();
 
   // Callback to return whether the operation succeeded.
@@ skipping 40 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MediaDrmStorage);
 };
 
 using CreateStorageCB = base::Callback<std::unique_ptr<MediaDrmStorage>()>;
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_DRM_STORAGE_H_