Adds a gfx_export.h to ui/gfx and converts all code in ui/gfx to

ui/gfx/image/image_util.h

 // Copyright (c) 2012 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_
 
 #include <vector>
 
 #include "base/basictypes.h"
-#include "ui/base/ui_export.h"
+#include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 class Image;
 }
 
 namespace gfx {
 
 // Creates an image from the given JPEG-encoded input. If there was an error
 // creating the image, returns an IsEmpty() Image.
 UI_EXPORT Image ImageFrom1xJPEGEncodedData(const unsigned char* input,
                                            size_t input_size);
 
 // Fills the |dst| vector with JPEG-encoded bytes of the 1x representation of
 // the given image.
 // Returns true if the image has a 1x representation and the 1x representation
 // was encoded successfully.
 // |quality| determines the compression level, 0 == lowest, 100 == highest.
 // Returns true if the Image was encoded successfully.
 UI_EXPORT bool JPEG1xEncodedDataFromImage(const Image& image,
                                           int quality,
                                           std::vector<unsigned char>* dst);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_UTIL_H_