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

ui/gfx/codec/png_codec.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_CODEC_PNG_CODEC_H_
 #define UI_GFX_CODEC_PNG_CODEC_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
-#include "ui/base/ui_export.h"
+#include "ui/gfx/gfx_export.h"
 
 class SkBitmap;
 
 namespace gfx {
 
 class Size;
 
 // Interface for encoding and decoding PNG data. This is a wrapper around
 // libpng, which has an inconvenient interface for callers. This is currently
 // designed for use in tests only (where we control the files), so the handling
@@ skipping 96 matching lines @@
   static SkBitmap* CreateSkBitmapFromBGRAFormat(
       const std::vector<unsigned char>& bgra, int width, int height);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PNGCodec);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_CODEC_PNG_CODEC_H_