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

ui/gfx/size_base.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_SIZE_BASE_H_
 #define UI_GFX_SIZE_BASE_H_
 
-#include "ui/base/ui_export.h"
+#include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 
 // A size has width and height values.
 template<typename Class, typename Type>
 class UI_EXPORT SizeBase {
  public:
   Type width() const { return width_; }
   Type height() const { return height_; }
 
@@ skipping 41 matching lines @@
   ~SizeBase() {}
 
  private:
   Type width_;
   Type height_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SIZE_BASE_H_