[api] Add interceptor for defineProperty().

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 23ac7cea559046c152cf6eddf35eff24fca61507..afee50a8e3eb5059f1090b66a00b48b06e465e19 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2141,6 +2141,9 @@ class JSObject: public JSReceiver {
   MUST_USE_RESULT static Maybe<bool> SetPropertyWithInterceptor(
       LookupIterator* it, ShouldThrow should_throw, Handle<Object> value);
 
+  MUST_USE_RESULT static Maybe<bool> DefinePropertyWithInterceptor(
+      LookupIterator* it, ShouldThrow should_throw, PropertyDescriptor& desc);
+
   // The API currently still wants DefineOwnPropertyIgnoreAttributes to convert
   // AccessorInfo objects to data fields. We allow FORCE_FIELD as an exception
   // to the default behavior that calls the setter.
@@ -10763,6 +10766,7 @@ class InterceptorInfo: public Struct {
   DECL_ACCESSORS(query, Object)
   DECL_ACCESSORS(deleter, Object)
   DECL_ACCESSORS(enumerator, Object)
+  DECL_ACCESSORS(definer, Object)
   DECL_ACCESSORS(data, Object)
   DECL_BOOLEAN_ACCESSORS(can_intercept_symbols)
   DECL_BOOLEAN_ACCESSORS(all_can_read)
@@ -10782,7 +10786,8 @@ class InterceptorInfo: public Struct {
   static const int kQueryOffset = kSetterOffset + kPointerSize;
   static const int kDeleterOffset = kQueryOffset + kPointerSize;
   static const int kEnumeratorOffset = kDeleterOffset + kPointerSize;
-  static const int kDataOffset = kEnumeratorOffset + kPointerSize;
+  static const int kDefinerOffset = kEnumeratorOffset + kPointerSize;
+  static const int kDataOffset = kDefinerOffset + kPointerSize;
   static const int kFlagsOffset = kDataOffset + kPointerSize;
   static const int kSize = kFlagsOffset + kPointerSize;