Add GetPropertyAttribute method for Object in the API

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index fb10c71576da0a92963b4decfe4dde60067a34fb..ea7ab82628fff450e43af3b9e40b13045d749aef 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1435,6 +1435,12 @@ class Object : public Value {
 
   V8EXPORT Local<Value> Get(uint32_t index);
 
+  /**
+   * Gets the property attributes of a property.

[Mads Ager (chromium), 2011/07/12 07:51:30]

You should document that this returns None if the property is not present and
otherwise returns the property attributes of the existing property.

+   * Can be None or any combination of ReadOnly, DontEnum and DontDelete.
+   */
+  V8EXPORT PropertyAttribute GetPropertyAttribute(Handle<Value> key);
+
   // TODO(1245389): Replace the type-specific versions of these
   // functions with generic ones that accept a Handle<Value> key.
   V8EXPORT bool Has(Handle<String> key);