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/tests/QuickRejectTest.cpp b/tests/QuickRejectTest.cpp
index 0000833..9d87bff 100644
--- a/tests/QuickRejectTest.cpp
+++ b/tests/QuickRejectTest.cpp
@@ -29,6 +29,12 @@
         return false;
     }
 
+#ifdef SK_DEVELOPER
+    virtual void toString(SkString* str) const SK_OVERRIDE {
+        str->append("TestLooper:");
+    }
+#endif
+
     SK_DECLARE_UNFLATTENABLE_OBJECT()
 };