[Tracing] Fix inaccurate timer calculation in runtime statistics.

src/counters.cc

 // 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.
 
 #include "src/counters.h"
 
 #include <iomanip>
 
 #include "src/base/platform/platform.h"
 #include "src/isolate.h"
@@ skipping 298 matching lines @@
 // static
 void RuntimeCallStats::CorrectCurrentCounterId(RuntimeCallStats* stats,
                                                CounterId counter_id) {
   DCHECK_NOT_NULL(stats->current_timer_);
   RuntimeCallCounter* counter = &(stats->*counter_id);
   stats->current_timer_->counter_ = counter;
 }
 
 void RuntimeCallStats::Print(std::ostream& os) {
   RuntimeCallStatEntries entries;
+  if (current_timer_ != NULL) {
+    current_timer_->Elapsed();
+  }
 
 #define PRINT_COUNTER(name) entries.Add(&this->name);
   FOR_EACH_MANUAL_COUNTER(PRINT_COUNTER)
 #undef PRINT_COUNTER
 
 #define PRINT_COUNTER(name, nargs, ressize) entries.Add(&this->Runtime_##name);
   FOR_EACH_INTRINSIC(PRINT_COUNTER)
 #undef PRINT_COUNTER
 
 #define PRINT_COUNTER(name) entries.Add(&this->Builtin_##name);
@@ skipping 32 matching lines @@
 #undef RESET_COUNTER
 
 #define RESET_COUNTER(name) this->Handler_##name.Reset();
   FOR_EACH_HANDLER_COUNTER(RESET_COUNTER)
 #undef RESET_COUNTER
 
   in_use_ = true;
 }
 
 void RuntimeCallStats::Dump(v8::tracing::TracedValue* value) {
+  if (current_timer_ != NULL) {
+    current_timer_->Elapsed();
+  }
 #define DUMP_COUNTER(name) \
   if (this->name.count > 0) this->name.Dump(value);
   FOR_EACH_MANUAL_COUNTER(DUMP_COUNTER)
 #undef DUMP_COUNTER
 
 #define DUMP_COUNTER(name, nargs, result_size) \
   if (this->Runtime_##name.count > 0) this->Runtime_##name.Dump(value);
   FOR_EACH_INTRINSIC(DUMP_COUNTER)
 #undef DUMP_COUNTER
 
@@ skipping 10 matching lines @@
 #define DUMP_COUNTER(name) \
   if (this->Handler_##name.count > 0) this->Handler_##name.Dump(value);
   FOR_EACH_HANDLER_COUNTER(DUMP_COUNTER)
 #undef DUMP_COUNTER
 
   in_use_ = false;
 }
 
 }  // namespace internal
 }  // namespace v8