Make a couple of SurfaceAggregatorPerfTests

cc/debug/lap_timer.cc

Index: cc/debug/lap_timer.cc
diff --git a/cc/debug/lap_timer.cc b/cc/debug/lap_timer.cc
index 10d26f94f4de514b0094b464efeec0dddf7a37f1..17bca3d313f11869563d90728bbb46741b345d9e 100644
--- a/cc/debug/lap_timer.cc
+++ b/cc/debug/lap_timer.cc
@@ -15,6 +15,11 @@ base::TimeTicks Now() {
                                                  : base::TimeTicks::Now();
 }
 
+// Default values.
+static const int kTimeLimitMillis = 3000;
+static const int kWarmupRuns = 5;
+static const int kTimeCheckInterval = 10;
+
 }  // namespace
 
 LapTimer::LapTimer(int warmup_laps,
@@ -29,6 +34,12 @@ LapTimer::LapTimer(int warmup_laps,
   Reset();
 }
 
+LapTimer::LapTimer()
+    : LapTimer(kWarmupRuns,
+               base::TimeDelta::FromMilliseconds(kTimeLimitMillis),
+               kTimeCheckInterval) {
+}
+
 void LapTimer::Reset() {
   accumulator_ = base::TimeDelta();
   num_laps_ = 0;