record drawfilters

gm/drawfilter.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
@@ skipping 39 matching lines @@
                     kLow_SkBlurQuality);
     }
 
     void onDraw(SkCanvas* canvas) override {
         SkPaint p;
         p.setColor(SK_ColorBLUE);
         p.setMaskFilter(fBlur);
         SkRect r = { 20, 20, 100, 100 };
         canvas->setDrawFilter(nullptr);
         canvas->drawRect(r, p);
-        TestFilter redNoBlur;
-        canvas->setDrawFilter(&redNoBlur);
+        canvas->setDrawFilter(new TestFilter)->unref();
         canvas->translate(120.0f, 40.0f);
         canvas->drawRect(r, p);
-
-        // Must unset if the DrawFilter is from the stack to avoid refcount errors!
         canvas->setDrawFilter(nullptr);
     }
 
 private:
     typedef GM INHERITED;
 };
 
 DEF_GM( return new DrawFilterGM; )
 
 #endif