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

ui/base/clipboard/clipboard.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.
 
 #ifndef UI_BASE_CLIPBOARD_CLIPBOARD_H_
 #define UI_BASE_CLIPBOARD_CLIPBOARD_H_
 #pragma once
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "base/string16.h"
+#include "ui/ui_api.h"
 
 namespace gfx {
 class Size;
 }
 
 class FilePath;
 class SkBitmap;
 
 #if defined(TOOLKIT_USES_GTK)
 typedef struct _GtkClipboard GtkClipboard;
 #endif
 
 namespace ui {
 
-class Clipboard {
+class UI_API Clipboard {
  public:
   typedef std::string FormatType;
 
   // ObjectType designates the type of data to be stored in the clipboard. This
   // designation is shared across all OSes. The system-specific designation
   // is defined by FormatType. A single ObjectType might be represented by
   // several system-specific FormatTypes. For example, on Linux the CBF_TEXT
   // ObjectType maps to "text/plain", "STRING", and several other formats. On
   // windows it maps to CF_UNICODETEXT.
   enum ObjectType {
@@ skipping 242 matching lines @@
   static const char kMimeTypeText[];
   static const char kMimeTypeHTML[];
   static const char kMimeTypePNG[];
 
   DISALLOW_COPY_AND_ASSIGN(Clipboard);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_CLIPBOARD_CLIPBOARD_H_