Add v8::Object::GetOwnPropertyNames(context, filter) method

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 83b777d30948104bec43ba3c9926cd68ff637690..a17962816dbb4f600e2403c48e421b594b58999d 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2654,6 +2654,15 @@ enum AccessControl {
   PROHIBITS_OVERWRITING = 1 << 2
 };
 
+enum PropertyFilter {
+  ALL_PROPERTIES = 0,
+  ONLY_WRITABLE = 1,

[Yang, 2016/05/03 13:50:20]

"ONLY" is a bit misleading. When you use 3 as filter, it's neither only writable
nor only enumerable, but both.

Can we call them "INCLUDE_WRITABLE", etc.?

[jochen (gone - plz use gerrit), 2016/05/03 14:44:39]

would be nice to have a comment that says that this is a bit mask, etc..

[kozy, 2016/05/03 17:37:46]

Acknowledged.

[kozy, 2016/05/03 17:37:46]

Done.

+  ONLY_ENUMERABLE = 2,
+  ONLY_CONFIGURABLE = 4,
+  SKIP_STRINGS = 8,
+  SKIP_SYMBOLS = 16
+};
+
 /**
  * Integrity level for objects.
  */
@@ -2814,6 +2823,15 @@ class V8_EXPORT Object : public Value {
       Local<Context> context);
 
   /**
+   * Returns an array containing the names of the filtered properties
+   * of this object, including properties from prototype objects.  The
+   * array returned by this method contains the same values as would
+   * be enumerated by a for-in statement over this object.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Array> GetOwnPropertyNames(
+      Local<Context> context, PropertyFilter filter);
+
+  /**
    * Get the prototype object.  This does not skip objects marked to
    * be skipped by __proto__ and it does not consult the security
    * handler.