Make a couple of SurfaceAggregatorPerfTests

cc/debug/lap_timer.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_DEBUG_LAP_TIMER_H_
 #define CC_DEBUG_LAP_TIMER_H_
 
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
 
 // LapTimer is used to calculate average times per "Lap" in perf tests.
 // Current() reports the time since the last call to Start().
 // Store() adds the time since the last call to Start() to the accumulator, and
 // resets the start time to now. Stored() returns the accumulated time.
 // NextLap increments the lap counter, used in counting the per lap averages.
 // If you initialize the LapTimer with a non zero warmup_laps, it will ignore
 // the times for that many laps at the start.
 // If you set the time_limit then you can use HasTimeLimitExpired() to see if
 // the current accumulated time has crossed that threshold, with an optimization
 // that it only tests this every check_interval laps.
 class CC_EXPORT LapTimer {
  public:
   LapTimer(int warmup_laps, base::TimeDelta time_limit, int check_interval);
+  // Create LapTimer with sensible default values.
+  LapTimer();
   // Resets the timer back to it's starting state.
   void Reset();
   // Sets the start point to now.
   void Start();
   // Returns true if there are no more warmup laps to do.
   bool IsWarmedUp();
   // Advance the lap counter and update the accumulated time.
   // The accumulated time is only updated every check_interval laps.
   // If accumulating then the start point will also be updated.
   void NextLap();
@@ skipping 19 matching lines @@
   int remaining_no_check_laps_;
   base::TimeDelta time_limit_;
   int check_interval_;
 
   DISALLOW_COPY_AND_ASSIGN(LapTimer);
 };
 
 }  // namespace cc
 
 #endif  // CC_DEBUG_LAP_TIMER_H_