Refine bench_record and bench_playback:

bench/BenchTimer.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 SkBenchTimer_DEFINED
 #define SkBenchTimer_DEFINED
 
@@ skipping 21 matching lines @@
     void start(double durationScale = 1);
     void end();
     void truncatedEnd();
     double fCpu;
     double fWall;
     double fTruncatedCpu;
     double fTruncatedWall;
     double fGpu;
 
 private:
-    BenchSysTimer *fSysTimer;
-    BenchSysTimer *fTruncatedSysTimer;
+    BenchSysTimer* fSysTimer;
+    BenchSysTimer* fTruncatedSysTimer;
 #if SK_SUPPORT_GPU
-    BenchGpuTimer *fGpuTimer;
+    BenchGpuTimer* fGpuTimer;
 #endif
     double fDurationScale;  // for this start/end session
 };
 
+// Same as BenchTimer above, supporting only fWall but with much lower overhead.
+// (Typically, ~30ns instead of BenchTimer's ~1us.)
+class WallTimer {
+public:
+    WallTimer();
+    ~WallTimer();
+
+    void start(double durationScale = 1);
+    void end();
+
+    double fWall;
+
+private:
+    BenchSysTimer* fSysTimer;
+    double fDurationScale;
+};
+
 #endif