Use displayName in Error.stack rendering if present.

src/messages.h

 // Copyright 2006-2008 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.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 33 matching lines @@
   Handle<JSFunction> function_;
 };
 
 
 class CallSite {
  public:
   CallSite(Isolate* isolate, Handle<JSObject> call_site_obj);
 
   Handle<Object> GetFileName();
   Handle<Object> GetFunctionName();
+  Handle<Object> GetDebugName();
   Handle<Object> GetScriptNameOrSourceUrl();
   Handle<Object> GetMethodName();
   // Return 1-based line number, including line offset.
   int GetLineNumber();
   // Return 1-based column number, including column offset if first line.
   int GetColumnNumber();
   bool IsNative();
   bool IsToplevel();
   bool IsEval();
   bool IsConstructor();
@@ skipping 500 matching lines @@
   static Handle<String> GetMessage(Isolate* isolate, Handle<Object> data);
   static base::SmartArrayPointer<char> GetLocalizedMessage(Isolate* isolate,
                                                            Handle<Object> data);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_