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/SkColor.h b/include/core/SkColor.h
index c17068f..6b86e7e 100644
--- a/include/core/SkColor.h
+++ b/include/core/SkColor.h
@@ -152,12 +152,12 @@
 
 /** Return a SkPMColor value from unpremultiplied 8 bit component values
 */
-SkPMColor SkPreMultiplyARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b);
+SK_API SkPMColor SkPreMultiplyARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b);
 /** Return a SkPMColor value from a SkColor value. This is done by multiplying the color
     components by the color's alpha, and by arranging the bytes in a configuration
     dependent order, to match the format of kARGB32 bitmaps.
 */
-SkPMColor SkPreMultiplyColor(SkColor c);
+SK_API SkPMColor SkPreMultiplyColor(SkColor c);
 
 /** Define a function pointer type for combining two premultiplied colors
 */