skia: Add SK_API to SkDiscardableMemory.

R=scroggo@google.com, reed@google.com, bsalomon@chromium.org
BUG=229120

Author: ernstm@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23385003

git-svn-id: http://skia.googlecode.com/svn/trunk/src@10878 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/core/SkDiscardableMemory.h b/core/SkDiscardableMemory.h
index ca17db3..e1634ee 100644
--- a/core/SkDiscardableMemory.h
+++ b/core/SkDiscardableMemory.h
@@ -14,7 +14,7 @@
  *  Interface for discardable memory. Implementation is provided by the
  *  embedder.
  */
-class SkDiscardableMemory {
+class SK_API SkDiscardableMemory {
 
 public:
     /**