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

ui/gfx/image/image.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.
 
 // An Image wraps an image any flavor, be it platform-native GdkBitmap/NSImage,
 // or a SkBitmap. This also provides easy conversion to other image types
 // through operator overloading. It will cache the converted representations
 // internally to prevent double-conversion.
 //
 // The lifetime of both the initial representation and any converted ones are
 // tied to the lifetime of the Image's internal storage. To allow Images to be
 // cheaply passed around by value, the actual image data is stored in a ref-
 // counted member. When all Images referencing this storage are deleted, the
 // actual representations are deleted, too.
 
 #ifndef UI_GFX_IMAGE_IMAGE_H_
 #define UI_GFX_IMAGE_IMAGE_H_
 #pragma once
 
 #include <map>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
-#include "build/build_config.h"
 #include "ui/gfx/native_widget_types.h"  // Forward-declares GdkPixbuf and NSImage.

[rvargas (doing something else), 2011/07/12 21:40:19]

nit: do you mind fixing this comment?

+#include "ui/ui_api.h"
 
 class SkBitmap;
 
 namespace {
 class ImageTest;
 class ImageMacTest;
 }
 
 namespace gfx {
 
 namespace internal {
 class ImageRep;
 class ImageStorage;
 }
 
-class Image {
+class UI_API Image {
  public:
   enum RepresentationType {
     kImageRepGdk,
     kImageRepCocoa,
     kImageRepSkia,
   };
 
   typedef std::map<RepresentationType, internal::ImageRep*> RepresentationMap;
 
   // Creates a new image with the default representation. The object will take
@@ skipping 92 matching lines @@
   // be cheaply copied.
   scoped_refptr<internal::ImageStorage> storage_;
 
   friend class ::ImageTest;
   friend class ::ImageMacTest;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_H_