Add base::Value::GetTypeName().

base/values.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file specifies a recursive data storage class called Value intended for
 // storing settings and other persistable data.
 //
 // A Value represents something that can be stored in JSON or passed to/from
 // JavaScript. As such, it is NOT a generalized variant type, since only the
 // types supported by JavaScript/JSON are supported.
@@ skipping 47 matching lines @@
     TYPE_BINARY,
     TYPE_DICTIONARY,
     TYPE_LIST
     // Note: Do not add more types. See the file-level comment above for why.
   };
 
   virtual ~Value();
 
   static std::unique_ptr<Value> CreateNullValue();
 
+  // Returns the name for a given |type|.
+  static const char* GetTypeName(Type type);
+
   // Returns the type of the value stored by the current Value object.
   // Each type will be implemented by only one subclass of Value, so it's
   // safe to use the Type to determine whether you can cast from
   // Value* to (Implementing Class)*.  Also, a Value object never changes
   // its type after construction.
   Type GetType() const { return type_; }
 
   // Returns true if the current object represents a given type.
   bool IsType(Type type) const { return type == type_; }
 
@@ skipping 482 matching lines @@
 }
 
 BASE_EXPORT inline std::ostream& operator<<(std::ostream& out,
                                             const ListValue& value) {
   return out << static_cast<const Value&>(value);
 }
 
 }  // namespace base
 
 #endif  // BASE_VALUES_H_