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

ui/base/win/hwnd_util.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_WIN_HWND_UTIL_H_
 #define UI_BASE_WIN_HWND_UTIL_H_
 #pragma once
 
 #include <windows.h>
 
 #include "base/string16.h"
+#include "ui/base/ui_base_api.h"
 
 namespace gfx {
 class Size;
 }
 
 namespace ui {
 
 // A version of the GetClassNameW API that returns the class name in an
 // string16. An empty result indicates a failure to get the class name.
-string16 GetClassName(HWND hwnd);
+UI_BASE_API string16 GetClassName(HWND hwnd);
 
 // Useful for subclassing a HWND.  Returns the previous window procedure.
-WNDPROC SetWindowProc(HWND hwnd, WNDPROC wndproc);
+UI_BASE_API WNDPROC SetWindowProc(HWND hwnd, WNDPROC wndproc);
 
 // Pointer-friendly wrappers around Get/SetWindowLong(..., GWLP_USERDATA, ...)
 // Returns the previously set value.
-void* SetWindowUserData(HWND hwnd, void* user_data);
-void* GetWindowUserData(HWND hwnd);
+UI_BASE_API void* SetWindowUserData(HWND hwnd, void* user_data);
+UI_BASE_API void* GetWindowUserData(HWND hwnd);
 
 // Returns true if the specified window is the current active top window or one
 // of its children.
-bool DoesWindowBelongToActiveWindow(HWND window);
+UI_BASE_API bool DoesWindowBelongToActiveWindow(HWND window);
 
 // Sizes the window to have a client or window size (depending on the value of
 // |pref_is_client|) of pref, then centers the window over parent, ensuring the
 // window fits on screen.
-void CenterAndSizeWindow(HWND parent,
-                         HWND window,
-                         const gfx::Size& pref,
-                         bool pref_is_client);
+UI_BASE_API void CenterAndSizeWindow(HWND parent,
+                                     HWND window,
+                                     const gfx::Size& pref,
+                                     bool pref_is_client);
 
 // If |hwnd| is NULL logs various thing and CHECKs. Invoke right after calling
 // CreateWindow.
-void CheckWindowCreated(HWND hwnd);
+UI_BASE_API void CheckWindowCreated(HWND hwnd);
 
 }  // namespace ui
 
 #endif  // UI_BASE_WIN_HWND_UTIL_H_