Expose Object::DefineOwnProperty on the API

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 6b0aa2058841ce49215fcc1cb51013cc10227a10..ccad0684eeabb0165e7ce58fa43fccccdc1d53c3 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -714,6 +714,19 @@ function DefineProxyProperty(obj, p, attributes, should_throw) {
 }
 
 
+function DefineObjectPropertyFromAPI(obj, p, value, configurable, enumerable,
+                                     writable) {
+  DefineObjectProperty(obj, p, ToPropertyDescriptor({

[adamk, 2015/04/15 16:31:53]

I think you're entering too late, and should call DefineOwnProperty().  Please
add a test where the API method is called on an Array with the property
"length", as I think bad things will happen (see DefineArrayProperty for what
sort of special handling we do).

+    value: value,
+    configurable: configurable,
+    enumerable: enumerable,
+    writable: writable
+  }),
+                       true);
+  return this;
+}
+
+
 // ES5 8.12.9.
 function DefineObjectProperty(obj, p, desc, should_throw) {
   var current_array = %GetOwnProperty(obj, ToName(p));