Make visualbench timing continuous for no-reset mode

tools/VisualBench/TimingStateMachine.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 TimingStateMachine_DEFINED
 #define TimingStateMachine_DEFINED
 
@@ skipping 42 matching lines @@
 private:
     enum State {
         kPreWarm_State,
         kTiming_State,
     };
     enum InnerState {
         kTuning_InnerState,
         kTiming_InnerState,
     };
 
-    inline double elapsed();
-    void resetTimingState();
-    void recordMeasurement();
-
     int fCurrentFrame;
     int fLoops;
     double fLastMeasurement;
     double fStartTime;
     State fState;
     InnerState fInnerState;
 };
 
 #endif