Work around issue 11901 in 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';
@@ skipping 100 matching lines @@
 
     var match = _vmFrame.firstMatch(frame);
     if (match == null) {
       throw new FormatException("Couldn't parse VM stack trace line '$frame'.");
     }
 
     // Get the pieces out of the regexp match. Function, URI and line should
     // always be found. The column is optional.
     var member = match[1].replaceAll("<anonymous closure>", "<fn>");
     var uri = Uri.parse(match[2]);
+    // Work around issue 11901.
+    if (uri == new Uri(path: 'timer_impl.dart')) {
+      uri = Uri.parse('dart:async/timer_impl.dart');
+    }
     var line = int.parse(match[3]);
     var column = null;
     var columnMatch = match[4];
     if (columnMatch != null) {
       column = int.parse(columnMatch);
     }
     return new Frame(uri, line, column, member);
   }
 
   /// Parses a string representation of a Chrome/V8 stack frame.
@@ skipping 109 matching lines @@
     // their stack frames. However, if we do get a relative path, we should
     // handle it gracefully.
     if (uriOrPath.contains('\\')) return path.windows.toUri(uriOrPath);
     return Uri.parse(uriOrPath);
   }
 
   Frame(this.uri, this.line, this.column, this.member);
 
   String toString() => '$location in $member';
 }