Introduce ui.dll / libui.so for the component build.

ui/base/clipboard/clipboard_util_win.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.
 //
 // Some helper functions for working with the clipboard and IDataObjects.
 
 #ifndef UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_
 #define UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_
 #pragma once
 
 #include <shlobj.h>
 #include <string>
 #include <vector>
 
+#include "ui/ui_api.h"
+
 namespace ui {
 
-class ClipboardUtil {
+class UI_API ClipboardUtil {
  public:
   /////////////////////////////////////////////////////////////////////////////
   // Clipboard formats.
   static FORMATETC* GetUrlFormat();
   static FORMATETC* GetUrlWFormat();
   static FORMATETC* GetMozUrlFormat();
   static FORMATETC* GetPlainTextFormat();
   static FORMATETC* GetPlainTextWFormat();
   static FORMATETC* GetFilenameFormat();
   static FORMATETC* GetFilenameWFormat();
@@ skipping 33 matching lines @@
   // text/html.
   static std::string HtmlToCFHtml(const std::string& html,
                                   const std::string& base_url);
   static void CFHtmlToHtml(const std::string& cf_html, std::string* html,
                            std::string* base_url);
 };
 
 }
 
 #endif  // UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_