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

ui/gfx/shadow_value.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_SHADOW_VALUE_H_
 #define UI_GFX_SHADOW_VALUE_H_
 
 #include <string>
 #include <vector>
 
 #include "third_party/skia/include/core/SkColor.h"
-#include "ui/base/ui_export.h"
+#include "ui/gfx/gfx_export.h"
 #include "ui/gfx/point.h"
 
 namespace gfx {
 
 class Insets;
 
 class ShadowValue;
 typedef std::vector<ShadowValue> ShadowValues;
 
 // ShadowValue encapsulates parameters needed to define a shadow, including the
@@ skipping 30 matching lines @@
   // transitions from full shadow color to fully transparent and with 2 pixels
   // inside the shadow and 2 pixels goes beyond the edge.
   double blur_;
 
   SkColor color_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SHADOW_VALUE_H_