Added toString to SkDrawLooper-derived classes

https://codereview.appspot.com/7195054/



git-svn-id: http://skia.googlecode.com/svn/trunk@7422 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/effects/SkBlurDrawLooper.h b/include/effects/SkBlurDrawLooper.h
index c410761..e968857 100644
--- a/include/effects/SkBlurDrawLooper.h
+++ b/include/effects/SkBlurDrawLooper.h
@@ -43,6 +43,7 @@
     virtual void init(SkCanvas*);
     virtual bool next(SkCanvas*, SkPaint* paint);
 
+    SK_DEVELOPER_TO_STRING()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurDrawLooper)
 
 protected: