[GCM] Move registration info persistence from extension state store to GCM store

google_apis/gcm/engine/registration_info.h

+// Copyright 2014 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 GOOGLE_APIS_GCM_ENGINE_REGISTRATION_INFO_H_
+#define GOOGLE_APIS_GCM_ENGINE_REGISTRATION_INFO_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "google_apis/gcm/base/gcm_export.h"
+
+namespace gcm {
+
+struct GCM_EXPORT RegistrationInfo {
+  RegistrationInfo();
+  ~RegistrationInfo();
+
+  std::string SerializeAsString() const;
+  bool ParseFromString(const std::string& value);
+
+  std::vector<std::string> sender_ids;
+  std::string registration_id;
+};
+
+// Map of app id to registration info.
+typedef std::map<std::string, RegistrationInfo> RegistrationInfoMap;
+
+}  // namespace gcm
+
+#endif  // GOOGLE_APIS_GCM_ENGINE_REGISTRATION_INFO_H_