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/core/SkShader.h b/include/core/SkShader.h
index c59cc59..d837284 100644
--- a/include/core/SkShader.h
+++ b/include/core/SkShader.h
@@ -32,7 +32,7 @@
     any object (other than a bitmap) that is drawn with that paint will get its color(s) from the
     shader.
 */
-class SkShader : public SkFlattenable {
+class SK_API SkShader : public SkFlattenable {
 public:
             SkShader();
     virtual ~SkShader();