extend SkBenchmark to allow a bench to return a durationScale, which allows it to perform fewer act…

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 28 matching lines @@
 }
 
 BenchTimer::~BenchTimer() {
     delete fSysTimer;
     delete fTruncatedSysTimer;
 #if SK_SUPPORT_GPU
     delete fGpuTimer;
 #endif
 }
 
-void BenchTimer::start() {
+void BenchTimer::start(double durationScale) {
+    fDurationScale = durationScale;
+
     fSysTimer->startWall();
     fTruncatedSysTimer->startWall();
 #if SK_SUPPORT_GPU
     if (fGpuTimer) {
         fGpuTimer->startGpu();
     }
 #endif
     fSysTimer->startCpu();
     fTruncatedSysTimer->startCpu();
 }
 
 void BenchTimer::end() {
-    fCpu = fSysTimer->endCpu();
+    fCpu = fSysTimer->endCpu() * fDurationScale;
 #if SK_SUPPORT_GPU
     //It is important to stop the cpu clocks first,
     //as the following will cpu wait for the gpu to finish.
     if (fGpuTimer) {
-        fGpu = fGpuTimer->endGpu();
+        fGpu = fGpuTimer->endGpu() * fDurationScale;
     }
 #endif
-    fWall = fSysTimer->endWall();
+    fWall = fSysTimer->endWall() * fDurationScale;
 }
 
 void BenchTimer::truncatedEnd() {
-    fTruncatedCpu = fTruncatedSysTimer->endCpu();
-    fTruncatedWall = fTruncatedSysTimer->endWall();
+    fTruncatedCpu = fTruncatedSysTimer->endCpu() * fDurationScale;
+    fTruncatedWall = fTruncatedSysTimer->endWall() * fDurationScale;
 }