Add functionality to get full stack trace when exceptions are thrown.

runtime/lib/errors_patch.dart

 // Copyright (c) 2012, 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.
 
 patch class Error {
   /* patch */ static String _objectToString(Object object) {
     return Object._toString(object);
   }
 }
 
@@ skipping 132 matching lines @@
       msg_buf.add( 
           "NoSuchMethodError: incorrect number of arguments passed to "
           "method named '$_memberName'\n"
           "Receiver: ${Error.safeToString(_receiver)}\n"
           "Tried calling: $_memberName($actualParameters)\n"
           "Found: $_memberName($formalParameters)");
     }
     return msg_buf.toString();
   }
 }
+
+patch class Stacktrace {
+  /* patch */ String get fullStacktrace native "Stacktrace_getFullStacktrace";
+
+  /* patch */ String get stacktrace native "Stacktrace_getStacktrace";
+
+  /* patch */ void _setupFullStacktrace()
+      native "Stacktrace_setupFullStacktrace";
+}