[inspector] exposed builtins for injected script source

src/inspector/injected_script_externs.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.
 
 /** @interface */
 function InjectedScriptHostClass()
 {
 }
 
 /**
@@ skipping 52 matching lines @@
  * @return {number}
  */
 InjectedScriptHostClass.prototype.bind = function(value, groupName) {}
 
 /**
  * @param {!Object} object
  * @return {!Object}
  */
 InjectedScriptHostClass.prototype.proxyTargetValue = function(object) {}
 
+/**
+ * @param {!Object} obj
+ * @return {!Array<string>}
+ */
+InjectedScriptHostClass.prototype.keys = function(obj) {}
+
+/**
+ * @param {!Object} obj
+ * @return {Object}
+ */
+InjectedScriptHostClass.prototype.getPrototypeOf = function(obj) {}
+
+/**
+ * @param {!Object} obj
+ * @param {string} prop
+ * @return {Object}
+ */
+InjectedScriptHostClass.prototype.getOwnPropertyDescriptor = function(obj, prop) {}
+
+/**
+ * @param {!Object} obj
+ * @return {!Array<string>}
+ */
+InjectedScriptHostClass.prototype.getOwnPropertyNames = function(obj) {}
+
+/**
+ * @param {!Object} obj
+ * @return {!Array<symbol>}
+ */
+InjectedScriptHostClass.prototype.getOwnPropertySymbols = function(obj) {}
+
 /** @type {!InjectedScriptHostClass} */
 var InjectedScriptHost;
 /** @type {!Window} */
 var inspectedGlobalObject;
 /** @type {number} */
 var injectedScriptId;