[V8] Add FunctionMirror.prototype.contextDebugId method

src/debug/mirrors.js

 // Copyright 2006-2012 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.
 
 (function(global, utils) {
 "use strict";
 
 // ----------------------------------------------------------------------------
 // Imports
 
@@ skipping 1019 matching lines @@
     return new ScopeMirror(UNDEFINED, this, index);
   }
 };
 
 
 FunctionMirror.prototype.toText = function() {
   return this.source();
 };
 
 
+FunctionMirror.prototype.contextDebugId = function() {

[Yang, 2016/03/29 11:52:17]

Why do we not return a ContextMirror like ScriptMirror.context() does?

[kozy, 2016/03/29 17:45:15]

Done.

+  if (this.resolved()) {
+    return %FunctionGetContextDebugId(this.value_);
+  }
+};
+
+
 /**
  * Mirror object for unresolved functions.
  * @param {string} value The name for the unresolved function reflected by this
  *     mirror.
  * @constructor
  * @extends ObjectMirror
  */
 function UnresolvedFunctionMirror(value) {
   // Construct this using the ValueMirror as an unresolved function is not a
   // real object but just a string.
@@ skipping 1992 matching lines @@
 // Functions needed by the debugger runtime.
 utils.InstallFunctions(utils, DONT_ENUM, [
   "ClearMirrorCache", ClearMirrorCache
 ]);
 
 // Export to debug.js
 utils.Export(function(to) {
   to.MirrorType = MirrorType;
 });
 })