Add loopSKP flag to nanobench

bench/SKPBench.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SKPBench_DEFINED
 #define SKPBench_DEFINED
 
 #include "Benchmark.h"
 #include "SkCanvas.h"
 #include "SkPicture.h"
 
 /**
  * Runs an SkPicture as a benchmark by repeatedly drawing it scaled inside a device clip.
  */
 class SKPBench : public Benchmark {
 public:
     SKPBench(const char* name, const SkPicture*, const SkIRect& devClip, SkScalar scale,
-             bool useMultiPictureDraw);
+             bool useMultiPictureDraw, bool doLooping);
     ~SKPBench() override;
 
+    int calculateLoops(int defaultLoops) const override {
+        return fDoLooping ? defaultLoops : 1;
+    }
+
 protected:
     const char* onGetName() override;
     const char* onGetUniqueName() override;
     void onPerCanvasPreDraw(SkCanvas*) override;
     void onPerCanvasPostDraw(SkCanvas*) override;
     bool isSuitableFor(Backend backend) override;
     void onDraw(const int loops, SkCanvas* canvas) override;
     SkIPoint onGetSize() override;
 
     virtual void drawMPDPicture();
     virtual void drawPicture();
 
     const SkPicture* picture() const { return fPic; }
     const SkTDArray<SkSurface*>& surfaces() const { return fSurfaces; }
     const SkTDArray<SkIRect>& tileRects() const { return fTileRects; }
 
 private:
     SkAutoTUnref<const SkPicture> fPic;
     const SkIRect fClip;
     const SkScalar fScale;
     SkString fName;
     SkString fUniqueName;
 
     const bool fUseMultiPictureDraw;
     SkTDArray<SkSurface*> fSurfaces;   // for MultiPictureDraw
     SkTDArray<SkIRect> fTileRects;     // for MultiPictureDraw
 
+    const bool fDoLooping;
+
     typedef Benchmark INHERITED;
 };
 
 #endif