Turn on quilt mode in DM.

gm/lerpmode.cpp

 /*
  * Copyright 2013 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 "SkCanvas.h"
 #include "SkLerpXfermode.h"
@@ skipping 21 matching lines @@
     canvas->drawOval(r, paint);
 
     canvas->restore();
 }
 
 class LerpXfermodeGM : public skiagm::GM {
 public:
     LerpXfermodeGM() {}
 
 protected:
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        return kSkipTiled_Flag;
+    }
+
     virtual SkString onShortName() SK_OVERRIDE {
         return SkString("lerpmode");
     }
 
     virtual SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(240, 120);
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         show_circlelayers(canvas, NULL);
         canvas->translate(150, 0);
         SkAutoTUnref<SkXfermode> mode(SkLerpXfermode::Create(0.5f));
         show_circlelayers(canvas, mode.get());
     }
 
 private:
     typedef skiagm::GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return SkNEW(LerpXfermodeGM); )