Created SerializedUserDataManager.

ios/web/public/serialized_user_data_manager.h

Index: ios/web/public/serialized_user_data_manager.h
diff --git a/ios/web/public/serialized_user_data_manager.h b/ios/web/public/serialized_user_data_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..639fac470c7c8fd2c538070241204c465277d95d
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+++ b/ios/web/public/serialized_user_data_manager.h
@@ -0,0 +1,53 @@
+// Copyright 2015 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 IOS_WEB_PUBLIC_SERIALIZED_USER_DATA_MANAGER_H_
+#define IOS_WEB_PUBLIC_SERIALIZED_USER_DATA_MANAGER_H_
+
+#include "base/supports_user_data.h"
+
+#if defined(__OBJC__)
+@protocol NSCoding;
+@class NSDictionary;
+@class NSString;
+typedef id<NSCoding> SerializedUserDataType;
+#else
+class NSDictionary;
+class NSString;
+typedef void* SerializedUserDataType;
+#endif  // defined(__OBJC__)
+
+namespace web {
+
+class NavigationManager;
+
+// Class that manages arbitrary persistent data that can be added to a
+// NavigationManager.
+class SerializedUserDataManager {
+ public:
+  virtual ~SerializedUserDataManager() {}
+
+  // Returns a SerializedUserDataManager for |manager|, lazily instantiating one
+  // if necessary.  |manager| must be non-null.
+  static SerializedUserDataManager* FromNavigationManager(
+      NavigationManager* manager);
+
+  // Associates |data| with the NavigationManager under |serialization_key|.
+  // |data| is retained by the manager, and |serialization_key| is copied.

[Eugene But (OOO till 7-30), 2015/09/24 17:05:07]

|serialization_key| can not be empty?

[kkhorimoto, 2015/09/24 21:24:29]

Done.

+  virtual void SetValueForSerializationKey(SerializedUserDataType data,
+                                           NSString* serialization_key) = 0;
+
+  // Returns the value associated with |serialization_key|.
+  virtual SerializedUserDataType GetValueForSerializationKey(
+      NSString* serialization_key) const = 0;

[Eugene But (OOO till 7-30), 2015/09/24 17:05:07]

ditto

[kkhorimoto, 2015/09/24 21:24:29]

Done.

+
+  // Returns an NSDictionary containing the serializable key value pairs.
+  virtual NSDictionary* GetSerializationDictionary() const = 0;
+
+  // Adds values and serialization keys from |dictionary| to the manager.

[Eugene But (OOO till 7-30), 2015/09/24 17:05:07]

|dictionary| can not be null?

[kkhorimoto, 2015/09/24 21:24:29]

Done.

+  virtual void AddValuesFromDictionary(NSDictionary* dictionary) = 0;
+};
+}
+
+#endif  // IOS_WEB_PUBLIC_SERIALIZED_USER_DATA_MANAGER_H_