[api] Add interceptor for getOwnPropertyDescriptor().

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 0cee2b9d606ad2d2bd6ddcf5a4f39cada3a17acb..1f0d0755d2f420b2d868c171af010d92f94719b1 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2066,7 +2066,7 @@ class JSObject: public JSReceiver {
   // [elements]: The elements (properties with names that are integers).
   //
   // Elements can be in two general modes: fast and slow. Each mode
-  // corrensponds to a set of object representations of elements that
+  // corresponds to a set of object representations of elements that
   // have something in common.
   //
   // In the fast mode elements is a FixedArray and so each element can
@@ -10789,6 +10789,7 @@ class InterceptorInfo: public Struct {
   DECL_ACCESSORS(getter, Object)
   DECL_ACCESSORS(setter, Object)
   DECL_ACCESSORS(query, Object)
+  DECL_ACCESSORS(descriptor, Object)
   DECL_ACCESSORS(deleter, Object)
   DECL_ACCESSORS(enumerator, Object)
   DECL_ACCESSORS(definer, Object)
@@ -10809,7 +10810,8 @@ class InterceptorInfo: public Struct {
   static const int kGetterOffset = HeapObject::kHeaderSize;
   static const int kSetterOffset = kGetterOffset + kPointerSize;
   static const int kQueryOffset = kSetterOffset + kPointerSize;
-  static const int kDeleterOffset = kQueryOffset + kPointerSize;
+  static const int kDescriptorOffset = kQueryOffset + kPointerSize;
+  static const int kDeleterOffset = kDescriptorOffset + kPointerSize;
   static const int kEnumeratorOffset = kDeleterOffset + kPointerSize;
   static const int kDefinerOffset = kEnumeratorOffset + kPointerSize;
   static const int kDataOffset = kDefinerOffset + kPointerSize;