Add visualbench option to not reset between samples

tools/VisualBench/VisualStreamTimingModule.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef VisualStreamTimingModule_DEFINED
 #define VisualStreamTimingModule_DEFINED
 
 #include "VisualModule.h"
 
 #include "TimingStateMachine.h"
 #include "VisualBench.h"
 #include "VisualBenchmarkStream.h"
 
 class SkCanvas;
 
 /*
  * VisualStreamTimingModule is the base class for modules which want to time a stream of Benchmarks.
  *
  * Subclasses should implement renderFrame, which is called for each frame, and timingFinished,
  * which is called when a sample has finished timing.
  */
 class VisualStreamTimingModule : public VisualModule {
 public:
-    VisualStreamTimingModule(VisualBench* owner, bool preWarmBeforeSample);
+    VisualStreamTimingModule(VisualBench* owner);
     void draw(SkCanvas* canvas) override;
 
 private:
     virtual void renderFrame(SkCanvas*, Benchmark*, int loops)=0;
 
     // subclasses should return true to advance the stream
     virtual bool timingFinished(Benchmark*, int loops, double measurement)=0;
 
     inline void handleInitState(SkCanvas*);
     inline void handleTimingEvent(SkCanvas*, TimingStateMachine::ParentEvents);
 
     TimingStateMachine fTSM;
     SkAutoTDelete<VisualBenchmarkStream> fBenchmarkStream;
     enum InitState {
         kNone_InitState,
         kReset_InitState,
         kNewBenchmark_InitState,
     };
     InitState fInitState;
-    bool fPreWarmBeforeSample;
 
     // support framework
     VisualBench* fOwner;
 
     typedef VisualModule INHERITED;
 };
 
 #endif