Add exports needed for glue to build as a component.

webkit/glue/glue_serialize.h

 // Copyright (c) 2011 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.
 //
 // This file contains (de)serialization (or if you like python, pickling)
 // methods for various objects that we want to persist.
 // In serialization, we write an object's state to a string in some opaque
 // format.  Deserialization reconstructs the object's state from such a string.
 
 #ifndef WEBKIT_GLUE_GLUE_SERIALIZE_H_
 #define WEBKIT_GLUE_GLUE_SERIALIZE_H_
 
 #include <string>
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebHistoryItem.h"
+#include "webkit/glue/webkit_glue_export.h"
 
 namespace webkit_glue {
 
 // HistoryItem serialization.
-std::string HistoryItemToString(const WebKit::WebHistoryItem& item);
-WebKit::WebHistoryItem HistoryItemFromString(
+WEBKIT_GLUE_EXPORT std::string HistoryItemToString(
+    const WebKit::WebHistoryItem& item);
+WEBKIT_GLUE_EXPORT WebKit::WebHistoryItem HistoryItemFromString(
     const std::string& serialized_item);
 
 // For testing purposes only.
-void HistoryItemToVersionedString(const WebKit::WebHistoryItem& item,
-                                  int version,
-                                  std::string* serialized_item);
+WEBKIT_GLUE_EXPORT void HistoryItemToVersionedString(
+    const WebKit::WebHistoryItem& item,
+    int version,
+    std::string* serialized_item);
 
 }  // namespace webkit_glue
 
 #endif  // #ifndef WEBKIT_GLUE_GLUE_SERIALIZE_H_