suppress pip for now, since we use locally-defined effects

git-svn-id: http://skia.googlecode.com/svn/trunk@5053 2bbb7eff-a529-9590-31e7-b0007b416f81

gm/texteffects.cpp

@@ -261,7 +261,12 @@ protected:
         
         canvas->restore();
     }
-    
+
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        // want to skip serialization due to custom effects only defined here
+        return kSkipPipe_Flag;
+    }
+
 private:
     typedef skiagm::GM INHERITED;
 };