Turn on quilt mode in DM.

gm/gradient_matrix.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 "SkCanvas.h"
 #include "SkColor.h"
 #include "SkGradientShader.h"
@@ skipping 102 matching lines @@
 
 namespace skiagm {
 
 class GradientMatrixGM : public GM {
 public:
     GradientMatrixGM() {
         this->setBGColor(0xFFDDDDDD);
     }
 
 protected:
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        return kSkipTiled_Flag;
+    }
+
     SkString onShortName() SK_OVERRIDE {
         return SkString("gradient_matrix");
     }
 
     virtual SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(800, 800);
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         draw_gradients(canvas, &make_linear_gradient,
                       linearPts, SK_ARRAY_COUNT(linearPts));
 
         canvas->translate(0, TESTGRID_Y);
 
         draw_gradients(canvas, &make_radial_gradient,
                       radialPts, SK_ARRAY_COUNT(radialPts));
     }
 
 private:
     typedef GM INHERITED;
 };
 
 DEF_GM( return new GradientMatrixGM; )
 }