Add loopSKP flag to nanobench

bench/Benchmark.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef Benchmark_DEFINED
 #define Benchmark_DEFINED
 
@@ skipping 47 matching lines @@
         kPDF_Backend,
         kHWUI_Backend,
     };
 
     // Call to determine whether the benchmark is intended for
     // the rendering mode.
     virtual bool isSuitableFor(Backend backend) {
         return backend != kNonRendering_Backend;
     }
 
+    virtual int calculateLoops(int defaultLoops) const {
+        return defaultLoops;
+    }
+
     // Call before draw, allows the benchmark to do setup work outside of the
     // timer. When a benchmark is repeatedly drawn, this should be called once
     // before the initial draw.
     void preDraw();
 
     // Called once before and after a series of draw calls to a single canvas.
     // The setup/break down in these calls is not timed.
     void perCanvasPreDraw(SkCanvas*);
     void perCanvasPostDraw(SkCanvas*);
 
@@ skipping 40 matching lines @@
     int     fForceAlpha;
     SkTriState::State  fDither;
     uint32_t    fOrMask, fClearMask;
 
     typedef SkRefCnt INHERITED;
 };
 
 typedef SkTRegistry<Benchmark*(*)(void*)> BenchRegistry;
 
 #endif