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diff --git a/ui/base/clipboard/custom_data_helper.h b/ui/base/clipboard/custom_data_helper.h
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+++ b/ui/base/clipboard/custom_data_helper.h
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+// 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.
+//
+// Due to restrictions of most operating systems, we don't directly map each
+// type of custom data to a native data transfer type. Instead, we serialize
+// each key-value pair into the pickle as a pair of string objects, and then
+// write the binary data in the pickle to the native data transfer object.
+
+#ifndef UI_BASE_CLIPBOARD_CUSTOM_DATA_HELPER_H_
+#define UI_BASE_CLIPBOARD_CUSTOM_DATA_HELPER_H_
+#pragma once
+
+#include <map>
+#include <vector>
+
+#include "base/string16.h"
+#include "ui/base/ui_export.h"
+
+class Pickle;
+
+namespace ui {
+
+UI_EXPORT void ReadCustomDataTypes(const void* data,
+                                   size_t data_length,
+                                   std::vector<string16>* types);
+UI_EXPORT void ReadCustomDataForType(const void* data,
+                                     size_t data_length,
+                                     const string16& type,
+                                     string16* result);
+UI_EXPORT void ReadCustomDataIntoMap(const void* data,
+                                     size_t data_length,
+                                     std::map<string16, string16>* result);
+
+UI_EXPORT void WriteCustomDataToPickle(const std::map<string16, string16>& data,
+                                       Pickle* pickle);
+
+}  // namespace ui
+
+#endif  // UI_BASE_CLIPBOARD_CLIPBOARD_H_