Refine bench_record and bench_playback:

bench/BenchTimer.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "BenchTimer.h"
 #if defined(SK_BUILD_FOR_WIN32)
     #include "BenchSysTimer_windows.h"
@@ skipping 58 matching lines @@
         fGpu = fGpuTimer->endGpu() * fDurationScale;
     }
 #endif
     fWall = fSysTimer->endWall() * fDurationScale;
 }
 
 void BenchTimer::truncatedEnd() {
     fTruncatedCpu = fTruncatedSysTimer->endCpu() * fDurationScale;
     fTruncatedWall = fTruncatedSysTimer->endWall() * fDurationScale;
 }
+
+WallTimer::WallTimer() : fWall(-1.0), fSysTimer(new BenchSysTimer) {}
+
+WallTimer::~WallTimer() {
+    delete fSysTimer;
+}
+
+void WallTimer::start(double durationScale) {
+    fDurationScale = durationScale;
+    fSysTimer->startWall();
+}
+
+void WallTimer::end() {
+    fWall = fSysTimer->endWall() * fDurationScale;
+}
+