Add code needed to build skia as a windows dll within the chromium project.
- Export/import skia APIs if SKIA_DLL is defined.
- This change has no effect on skia.

Review URL: http://codereview.appspot.com/4282042

git-svn-id: http://skia.googlecode.com/svn/trunk@944 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/effects/SkGradientShader.h b/include/effects/SkGradientShader.h
index c800c66..5623be4 100644
--- a/include/effects/SkGradientShader.h
+++ b/include/effects/SkGradientShader.h
@@ -26,7 +26,7 @@
     SkGradientShader hosts factories for creating subclasses of SkShader that
     render linear and radial gradients.
 */
-class SkGradientShader {
+class SK_API SkGradientShader {
 public:
     /** Returns a shader that generates a linear gradient between the two
         specified points.