Support "[as ...]" in V8 stack traces in pkg/stack_trace.

pkg/stack_trace/lib/src/frame.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library frame;
 
 
 import 'package:path/path.dart' as path;
 
 import 'trace.dart';
 
 // #1      Foo._bar (file:///home/nweiz/code/stuff.dart:42:21)
 final _vmFrame = new RegExp(
     r'^#\d+\s+([^\s].*) \((.+):(\d+):(\d+)\)$');
 
 //     at VW.call$0 (http://pub.dartlang.org/stuff.dart.js:560:28)
 //     at http://pub.dartlang.org/stuff.dart.js:560:28
 final _v8Frame = new RegExp(
-    r'^\s*at (?:([^\s].*) \((.+):(\d+):(\d+)\)|(.+):(\d+):(\d+))$');
+    r'^\s*at (?:([^\s].*?)(?: \[as [^\]]+\])? '
+    r'\((.+):(\d+):(\d+)\)|(.+):(\d+):(\d+))$');
 
 // .VW.call$0@http://pub.dartlang.org/stuff.dart.js:560
 // .VW.call$0("arg")@http://pub.dartlang.org/stuff.dart.js:560
 // .VW.call$0/name<@http://pub.dartlang.org/stuff.dart.js:560
 final _firefoxFrame = new RegExp(
     r'^([^@(/]*)(?:\(.*\))?(/[^<]*<?)?(?:\(.*\))?@(.*):(\d+)$');
 
 // foo/bar.dart 10:11 in Foo._bar
 // http://dartlang.org/foo/bar.dart in Foo._bar
 final _friendlyFrame = new RegExp(
@@ skipping 154 matching lines @@
 
     var line = match[2] == null ? null : int.parse(match[2]);
     var column = match[3] == null ? null : int.parse(match[3]);
     return new Frame(uri, line, column, match[4]);
   }
 
   Frame(this.uri, this.line, this.column, this.member);
 
   String toString() => '$location in $member';
 }