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

skia/ext/vector_canvas.h

 // Copyright (c) 2006-2009 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_VECTOR_CANVAS_H_
 #define SKIA_EXT_VECTOR_CANVAS_H_
 #pragma once
 
 #include "skia/ext/platform_canvas.h"
 #include "skia/ext/vector_platform_device.h"
 
 #if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 typedef struct _cairo cairo_t;
 #endif
 
 namespace skia {
 
 // This class is a specialization of the regular PlatformCanvas. It is designed
 // to work with a VectorDevice to manage platform-specific drawing. It allows
 // using both Skia operations and platform-specific operations. It *doesn't*
 // support reading back from the bitmap backstore since it is not used.
-class VectorCanvas : public PlatformCanvas {
+class SK_API VectorCanvas : public PlatformCanvas {
  public:
   VectorCanvas();
   explicit VectorCanvas(SkDeviceFactory* factory);
 #if defined(WIN32)
   VectorCanvas(HDC dc, int width, int height);
 #elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
   // Caller owns |context|. Ownership is not transferred.
   VectorCanvas(cairo_t* context, int width, int height);
 #endif
   virtual ~VectorCanvas();
@@ skipping 15 matching lines @@
 
   // Copy & assign are not supported.
   VectorCanvas(const VectorCanvas&);
   const VectorCanvas& operator=(const VectorCanvas&);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_VECTOR_CANVAS_H_