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diff --git a/dom/media/eme/clearkey/ClearKeyPersistence.h b/dom/media/eme/clearkey/ClearKeyPersistence.h
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+++ b/dom/media/eme/clearkey/ClearKeyPersistence.h
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+/*
+ * Copyright 2015, Mozilla Foundation and contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __ClearKeyPersistence_h__
+#define __ClearKeyPersistence_h__
+
+// This include is required in order for content_decryption_module to work
+// on Unix systems.
+#include <stddef.h>
+
+#include <functional>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "content_decryption_module.h"
+
+#include "RefCounted.h"
+
+class ClearKeySessionManager;
+
+// Whether we've loaded the persistent session ids yet.
+enum PersistentKeyState { UNINITIALIZED, LOADING, LOADED };
+
+class ClearKeyPersistence : public RefCounted {
+ public:
+  explicit ClearKeyPersistence(cdm::Host_10* aHost);
+
+  void EnsureInitialized(bool aPersistentStateAllowed,
+                         std::function<void()>&& aOnInitialized);
+
+  bool IsLoaded() const;
+
+  std::string GetNewSessionId(cdm::SessionType aSessionType);
+
+  bool IsPersistentSessionId(const std::string& aSid);
+
+  void PersistentSessionRemoved(std::string& aSid);
+
+ private:
+  cdm::Host_10* mHost = nullptr;
+
+  PersistentKeyState mPersistentKeyState = PersistentKeyState::UNINITIALIZED;
+
+  std::set<uint32_t> mPersistentSessionIds;
+
+  void ReadAllRecordsFromIndex(std::function<void()>&& aOnComplete);
+  void WriteIndex();
+};
+
+#endif  // __ClearKeyPersistence_h__