cc: Add best_record_time to rendering stats.

cc/debug/rendering_stats_instrumentation.cc

Index: cc/debug/rendering_stats_instrumentation.cc
diff --git a/cc/debug/rendering_stats_instrumentation.cc b/cc/debug/rendering_stats_instrumentation.cc
index 3c2c96b8b00b42f1722750ee77110a64d5423de5..a423eccef8180f38797b7fd274cc1b28762d3f39 100644
--- a/cc/debug/rendering_stats_instrumentation.cc
+++ b/cc/debug/rendering_stats_instrumentation.cc
@@ -105,12 +105,14 @@ void RenderingStatsInstrumentation::AddPaint(base::TimeDelta duration,
 }
 
 void RenderingStatsInstrumentation::AddRecord(base::TimeDelta duration,
+                                              base::TimeDelta best_duration,
                                               int64 pixels) {
   if (!record_rendering_stats_)
     return;
 
   base::AutoLock scoped_lock(lock_);
   main_stats_.record_time += duration;
+  main_stats_.best_record_time += best_duration;
   main_stats_.recorded_pixel_count += pixels;
 }