Build skia as a dll in windows multi-dll build.

skia/ext/skia_utils_win.h

 // Copyright (c) 2006-2008 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 SKIA_EXT_SKIA_UTILS_WIN_H_
 #define SKIA_EXT_SKIA_UTILS_WIN_H_
 #pragma once
 
 #include "third_party/skia/include/core/SkColor.h"
 
@@ skipping 21 matching lines @@
 }
 
 // Converts a Skia rect to a Windows RECT.
 // Both use same in-memory format. Verified by COMPILE_ASSERT() in
 // skia_utils.cc.
 inline const RECT& SkIRectToRECT(const SkIRect& rect) {
   return reinterpret_cast<const RECT&>(rect);
 }
 
 // Converts COLORREFs (0BGR) to the ARGB layout Skia expects.
-SkColor COLORREFToSkColor(COLORREF color);
+SK_API SkColor COLORREFToSkColor(COLORREF color);
 
 // Converts ARGB to COLORREFs (0BGR).
-COLORREF SkColorToCOLORREF(SkColor color);
+SK_API COLORREF SkColorToCOLORREF(SkColor color);
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_SKIA_UTILS_WIN_H_