[tracing] Make TracedValue accept const char* strings

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 11 matching lines @@
 
   static std::unique_ptr<TracedValue> Create();
 
   void EndDictionary();
   void EndArray();
 
   // 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 SetString(const char* name, const char* value);
+  void SetString(const char* name, const std::string& value) {
+    SetString(name, value.c_str());
+  }
   void BeginDictionary(const char* name);
   void BeginArray(const char* name);
 
   void AppendInteger(int);
   void AppendDouble(double);
   void AppendBoolean(bool);
-  void AppendString(const std::string&);
+  void AppendString(const char*);
+  void AppendString(const std::string& value) { AppendString(value.c_str()); }
   void BeginArray();
   void BeginDictionary();
 
   // ConvertableToTraceFormat implementation.
   void AppendAsTraceFormat(std::string* out) const override;
 
  private:
   TracedValue();
 
   void WriteComma();
   void WriteName(const char* name);
 
 #ifdef DEBUG
   // In debug builds checks the pairings of {Begin,End}{Dictionary,Array}
   std::vector<bool> nesting_stack_;
 #endif
 
   std::string data_;
   bool first_item_;
 
   DISALLOW_COPY_AND_ASSIGN(TracedValue);
 };
 
 }  // namespace tracing
 }  // namespace v8
 
 #endif  // V8_TRACING_TRACED_VALUE_H_