[JSON] implement indentation in the BasicJsonStringifier and expose via API.

include/v8.h

 // 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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 1640 matching lines @@
       Local<Context> context, Local<String> json_string);
 
   /**
    * Tries to stringify the JSON-serializable object |json_object| and returns
    * it as string if successful.
    *
    * \param json_object The JSON-serializable object to stringify.
    * \return The corresponding string if successfully stringified.
    */
   static V8_WARN_UNUSED_RESULT MaybeLocal<String> Stringify(
-      Local<Context> context, Local<Object> json_object);
+      Local<Context> context, Local<Object> json_object,
+      Local<String> gap = Local<String>());
 };
 
 
 /**
  * A map whose keys are referenced weakly. It is similar to JavaScript WeakMap
  * but can be created without entering a v8::Context and hence shouldn't
  * escape to JavaScript.
  */
 class V8_EXPORT NativeWeakMap : public Data {
  public:
@@ skipping 7071 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_