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

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 22030 matching lines @@
       v8::JSON::Parse(context.local(), v8_str("{\"x\":42}")).ToLocalChecked();
   Local<Object> obj = value->ToObject(context.local()).ToLocalChecked();
   Local<Object> global = context->Global();
   global->Set(context.local(), v8_str("obj"), obj).FromJust();
   Local<String> json =
       v8::JSON::Stringify(context.local(), obj).ToLocalChecked();
   v8::String::Utf8Value utf8(json);
   ExpectString("JSON.stringify(obj)", *utf8);
 }
 
+THREADED_TEST(JSONStringifyObjectWithGap) {
+  LocalContext context;
+  HandleScope scope(context->GetIsolate());
+  Local<Value> value =
+      v8::JSON::Parse(context.local(), v8_str("{\"x\":42}")).ToLocalChecked();
+  Local<Object> obj = value->ToObject(context.local()).ToLocalChecked();
+  Local<Object> global = context->Global();
+  global->Set(context.local(), v8_str("obj"), obj).FromJust();
+  Local<String> json =
+      v8::JSON::Stringify(context.local(), obj, v8_str("*")).ToLocalChecked();
+  v8::String::Utf8Value utf8(json);
+  ExpectString("JSON.stringify(obj, null,  '*')", *utf8);
+}
+
 #if V8_OS_POSIX && !V8_OS_NACL
 class ThreadInterruptTest {
  public:
   ThreadInterruptTest() : sem_(0), sem_value_(0) { }
   ~ThreadInterruptTest() {}
 
   void RunTest() {
     InterruptThread i_thread(this);
     i_thread.Start();
 
@@ skipping 3083 matching lines @@
 }
 
 TEST(PrivateForApiIsNumber) {
   LocalContext context;
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
 
   // Shouldn't crash.
   v8::Private::ForApi(isolate, v8_str("42"));
 }