Use TracedValue in runtime statistics.

src/tracing/traced-value.h

 // Copyright 2016 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_TRACING_TRACED_VALUE_H_
 #define V8_TRACING_TRACED_VALUE_H_
 
 #include <stddef.h>
 #include <memory>
 #include <string>
@@ skipping 16 matching lines @@
 
   // These methods assume that |name| is a long lived "quoted" string.
   void SetInteger(const char* name, int value);
   void SetDouble(const char* name, double value);
   void SetBoolean(const char* name, bool value);
   void SetString(const char* name, const std::string& value);
   void BeginDictionary(const char* name);
   void BeginArray(const char* name);
 
   void AppendInteger(int);
+  void AppendLongInteger(int64_t);
   void AppendDouble(double);
   void AppendBoolean(bool);
   void AppendString(const std::string&);
   void BeginArray();
   void BeginDictionary();
 
   // ConvertableToTraceFormat implementation.
   void AppendAsTraceFormat(std::string* out) const override;
 
  private:
@@ skipping 10 matching lines @@
   std::string data_;
   bool first_item_;
 
   DISALLOW_COPY_AND_ASSIGN(TracedValue);
 };
 
 }  // namespace tracing
 }  // namespace v8
 
 #endif  // V8_TRACING_TRACED_VALUE_H_