Fix bug with runtime-call-stats timers

src/counters.h

 // Copyright 2012 the V8 project 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 V8_COUNTERS_H_
 #define V8_COUNTERS_H_
 
 #include "include/v8.h"
 #include "src/allocation.h"
 #include "src/base/platform/elapsed-timer.h"
@@ skipping 487 matching lines @@
     parent_ = parent;
   }
 
   inline void Start() {
     timer_.Start();
     counter_->count++;
   }
 
   inline RuntimeCallTimer* Stop() {
     base::TimeDelta delta = timer_.Elapsed();
+    timer_.Stop();
     counter_->time += delta;
     if (parent_ != NULL) {
       parent_->AdjustForSubTimer(delta);
     }
     return parent_;
   }
 
   inline void AdjustForSubTimer(base::TimeDelta delta) {
     counter_->time -= delta;
   }
@@ skipping 471 matching lines @@
 
   explicit Counters(Isolate* isolate);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Counters);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COUNTERS_H_