[RuntimeCallStats] Fix reset scope for tracing

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 320 matching lines @@
 #undef PRINT_COUNTER
 
 #define PRINT_COUNTER(name) entries.Add(&this->Handler_##name);
   FOR_EACH_HANDLER_COUNTER(PRINT_COUNTER)
 #undef PRINT_COUNTER
 
   entries.Print(os);
 }
 
 void RuntimeCallStats::Reset() {
-  if (!FLAG_runtime_call_stats) return;
+  if (!FLAG_runtime_call_stats &&
+      !TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED())
+    return;
 #define RESET_COUNTER(name) this->name.Reset();
   FOR_EACH_MANUAL_COUNTER(RESET_COUNTER)
 #undef RESET_COUNTER
 
 #define RESET_COUNTER(name, nargs, result_size) this->Runtime_##name.Reset();
   FOR_EACH_INTRINSIC(RESET_COUNTER)
 #undef RESET_COUNTER
 
 #define RESET_COUNTER(name) this->Builtin_##name.Reset();
   BUILTIN_LIST_C(RESET_COUNTER)
 #undef RESET_COUNTER
 
 #define RESET_COUNTER(name) this->API_##name.Reset();
   FOR_EACH_API_COUNTER(RESET_COUNTER)
 #undef RESET_COUNTER
 
 #define RESET_COUNTER(name) this->Handler_##name.Reset();
   FOR_EACH_HANDLER_COUNTER(RESET_COUNTER)
 #undef RESET_COUNTER
+
+  in_use_ = true;
 }
 
 const char* RuntimeCallStats::Dump() {
   buffer_.str(std::string());
   buffer_.clear();
   buffer_ << "{";
 #define DUMP_COUNTER(name) \
   if (this->name.count > 0) this->name.Dump(buffer_);
   FOR_EACH_MANUAL_COUNTER(DUMP_COUNTER)
 #undef DUMP_COUNTER
@@ skipping 24 matching lines @@
     buffer_c_str_.reset(new char[length + 1]);
     len_ = length;
   }
   strncpy(buffer_c_str_.get(), buffer_str.c_str(), length + 1);
   in_use_ = false;
   return buffer_c_str_.get();
 }
 
 }  // namespace internal
 }  // namespace v8