Add special case circle blur for Ganesh

gm/blurcircles.cpp

 /*
 * Copyright 2014 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"
 #include "SkCanvas.h"
 #include "SkPaint.h"
 #include "SkString.h"
 
 class BlurCirclesGM : public skiagm::GM {
 public:
     BlurCirclesGM()
         : fName("blurcircles") {
     }
 
 protected:
+    bool runAsBench() const override { return true; }
 
     SkString onShortName() override {
         return fName;
     }
 
     SkISize onISize() override {
         return SkISize::Make(950, 950);
     }
 
     void onDraw(SkCanvas* canvas) override {
         canvas->scale(1.5f, 1.5f);
         canvas->translate(50,50);
 
         const float blurRadii[] = { 1,5,10,20 };
         const int circleRadii[] = { 5,10,25,50 };
         for (size_t i = 0; i < SK_ARRAY_COUNT(blurRadii); ++i) {
             SkAutoCanvasRestore autoRestore(canvas, true);
             canvas->translate(0, SkIntToScalar(150*i));
             for (size_t j = 0; j < SK_ARRAY_COUNT(circleRadii); ++j) {
                 SkMaskFilter* filter = SkBlurMaskFilter::Create(
                     kNormal_SkBlurStyle,

[bsalomon, 2015/09/11 13:05:45]

Given that there are only 4 blurs maybe we want to create the BMFs in the
onBeforePreOncePreDraw() function.

[robertphillips, 2015/09/11 15:55:34]

Done.

                     SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(blurRadii[i])),
                     SkBlurMaskFilter::kHighQuality_BlurFlag);
                 SkPaint paint;
                 paint.setColor(SK_ColorBLACK);
                 paint.setMaskFilter(filter)->unref();
 
                 canvas->drawCircle(SkIntToScalar(50),SkIntToScalar(50),SkIntToScalar(circleRadii[j]),paint);
                 canvas->translate(SkIntToScalar(150), 0);
+
             }
         }
     }
 private:
     const SkString  fName;
 
     typedef         skiagm::GM INHERITED;
 };
 
 DEF_GM(return new BlurCirclesGM();)