Expose JSON stringifier through V8 API

src/runtime/runtime.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.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/base/platform/time.h"
 #include "src/objects.h"
@@ skipping 1092 matching lines @@
       Isolate* isolate, Handle<JSReceiver> receiver, Handle<Object> key,
       LanguageMode language_mode);
 
   MUST_USE_RESULT static MaybeHandle<Object> SetObjectProperty(
       Isolate* isolate, Handle<Object> object, Handle<Object> key,
       Handle<Object> value, LanguageMode language_mode);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetObjectProperty(
       Isolate* isolate, Handle<Object> object, Handle<Object> key);
 
+  MUST_USE_RESULT static MaybeHandle<Object> BasicJsonStringify(
+      Isolate* isolate, Handle<Object> object);
+
+  MUST_USE_RESULT static MaybeHandle<Object> BasicJsonStringifyString(
+      Isolate* isolate, Handle<String> string);
+
   enum TypedArrayId {
     // arrayIds below should be synchronized with typedarray.js natives.
     ARRAY_ID_UINT8 = 1,
     ARRAY_ID_INT8 = 2,
     ARRAY_ID_UINT16 = 3,
     ARRAY_ID_INT16 = 4,
     ARRAY_ID_UINT32 = 5,
     ARRAY_ID_INT32 = 6,
     ARRAY_ID_FLOAT32 = 7,
     ARRAY_ID_FLOAT64 = 8,
@@ skipping 54 matching lines @@
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_