export SkImageInfo

BUG=skia:

Review URL: https://codereview.chromium.org/893603005
diff --git a/include/core/SkImageInfo.h b/include/core/SkImageInfo.h
index 341ec14..f928416 100644
--- a/include/core/SkImageInfo.h
+++ b/include/core/SkImageInfo.h
@@ -155,7 +155,7 @@
  *  Describe an image's dimensions and pixel type.
  *  Used for both src images and render-targets (surfaces).
  */
-struct SkImageInfo {
+struct SK_API SkImageInfo {
 public:
     SkImageInfo()
         : fWidth(0)