[runtime] [proxy] Make Object.prototype.hasOwnProperty support proxies

test/mjsunit/harmony/proxies-has-own-property.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-proxies
+
+var handler = {};
+var target = {a:1};
+var proxy = new Proxy(target, handler);
+
+assertTrue(target.hasOwnProperty('a'));
+assertTrue(proxy.hasOwnProperty('a'));
+assertFalse(target.hasOwnProperty('b'));
+assertFalse(proxy.hasOwnProperty('b'));
+
+
+handler.has = function() {
+  return false;
+}
+assertTrue(target.hasOwnProperty('a'));
+assertFalse(proxy.hasOwnProperty('a'));
+assertFalse(target.hasOwnProperty('b'));
+assertFalse(proxy.hasOwnProperty('b'));
+
+handler.has = function() {
+  return true;
+}
+assertTrue(target.hasOwnProperty('a'));
+assertTrue(proxy.hasOwnProperty('a'));
+assertFalse(target.hasOwnProperty('b'));
+assertTrue(proxy.hasOwnProperty('b'));
+
+handler.has = function() {
+  throw Error();
+}
+assertTrue(target.hasOwnProperty('a'));
+assertThrows(function(){ proxy.hasOwnProperty('a') }, Error);
+assertFalse(target.hasOwnProperty('b'));
+assertThrows(function(){ proxy.hasOwnProperty('b') }, Error);