LibJS: Implement Object.getOwnPropertyNames()

Author: https://github.com/awesomekling
Commit: f95a119627

Libraries/LibJS/Tests/Object.getOwnPropertyNames.js

@@ -0,0 +1,15 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var names = Object.getOwnPropertyNames([1, 2, 3]);
+
+    assert(names.length === 4);
+    assert(names[0] === '0');
+    assert(names[1] === '1');
+    assert(names[2] === '2');
+    assert(names[3] === 'length');
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}