Add tools/ddbg_service.

tools/ddbg_service/bin/ddbg_service.dart

+// Copyright (c) 2014, 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.
+
+// A command line debugger implemented using the VM Service protocol.
+
+library ddbg2;
+
+import "dart:async";
+
+import 'package:ddbg/debugger.dart';
+
+Debugger debugger;
+
+void onError(self, parent, zone, error, StackTrace trace) {
+  if (debugger != null) {
+    debugger.onUncaughtError(error, trace);
+  } else {
+    print('\n--------\nExiting due to unexpected error:\n'
+          '  $error\n$trace\n');
+    exit();
+  }
+}
+
+void main(List<String> args) {
+  // Setup a zone which will exit the debugger cleanly on any uncaught
+  // exception.
+  var zone = Zone.ROOT.fork(specification:new ZoneSpecification(
+      handleUncaughtError: onError));
+  
+  zone.run(() {
+      debugger = new Debugger();
+  });
+}