[GCM] Adding AccountInfo structure to persist accounts mapped to GCM

google_apis/gcm/engine/account_info.h

Index: google_apis/gcm/engine/account_info.h
diff --git a/google_apis/gcm/engine/account_info.h b/google_apis/gcm/engine/account_info.h
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+// 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_ACCOUNT_INFO_H_
+#define GOOGLE_APIS_GCM_ENGINE_ACCOUNT_INFO_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/time/time.h"
+#include "google_apis/gcm/base/gcm_export.h"
+
+namespace gcm {
+
+// Stores information about Account and a last message sent with the information
+// about that account.
+struct GCM_EXPORT AccountInfo {
+  // Indicates whether a message, if sent, was adding or removing account
+  // mapping.
+  enum MessageType {
+    MSG_NONE,    // No message has been sent.
+    MSG_ADD,     // Account was mapped to device by the message.
+    MSG_REMOVE,  // Account mapping to device was removed by the message.
+  };
+
+  AccountInfo();
+  ~AccountInfo();
+
+  // Serializes account info to string without |account_id|.
+  std::string SerializeAsString() const;
+  // Parses account info from store, without |account_id|.
+  bool ParseFromString(const std::string& value);
+
+  // Gaia ID of the account.
+  std::string account_id;
+  // Email address of the tracked account.
+  std::string email;
+  // Type of the last mapping message sent to GCM.
+  MessageType last_message_type;
+  // ID of the last mapping message sent to GCM.
+  std::string last_message_id;
+  // Timestamp of when the last mapping message was sent to GCM.
+  base::Time last_message_timestamp;
+};
+
+}  // namespace gcm
+
+#endif  // GOOGLE_APIS_GCM_ENGINE_ACCOUNT_INFO_H_