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

ui/gfx/image/image_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_GFX_IMAGE_IMAGE_UTIL_H_
 #define UI_GFX_IMAGE_IMAGE_UTIL_H_
 #pragma once
 
 #include <vector>
 
 #include "base/basictypes.h"
+#include "ui/ui_api.h"
 
 namespace gfx {
 class Image;
 }
 
 namespace gfx {
 
 // Creates an image from the given PNG-encoded input.  The caller owns the
 // returned Image.  If there was an error creating the image, returns NULL.
-Image* ImageFromPNGEncodedData(const unsigned char* input, size_t input_size);
+UI_API Image* ImageFromPNGEncodedData(const unsigned char* input,
+                                      size_t input_size);
 
 // Fills the |dst| vector with PNG-encoded bytes based on the given Image.
 // Returns true if the Image was encoded successfully.
-bool PNGEncodedDataFromImage(const Image& image,
-                             std::vector<unsigned char>* dst);
+UI_API bool PNGEncodedDataFromImage(const Image& image,
+                                    std::vector<unsigned char>* dst);
 
 }
 
 #endif  // UI_GFX_IMAGE_IMAGE_UTIL_H_