Use TracedValue in runtime statistics.

src/tracing/traced-value.h

Index: src/tracing/traced-value.h
diff --git a/src/tracing/traced-value.h b/src/tracing/traced-value.h
index befa387bc875c0dbb15c8c16f2776e6fd2cc823c..b5c265cd48831b023abe15ca6f1bfe89b90667f2 100644
--- a/src/tracing/traced-value.h
+++ b/src/tracing/traced-value.h
@@ -34,6 +34,7 @@ class TracedValue : public ConvertableToTraceFormat {
   void BeginArray(const char* name);
 
   void AppendInteger(int);
+  void AppendLongInteger(int64_t);
   void AppendDouble(double);
   void AppendBoolean(bool);
   void AppendString(const std::string&);