Allow command aliases in Observatory debugger.

runtime/observatory/lib/src/cli/command.dart

 // Copyright (c) 2015, 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.
 
 part of cli;
 
 // Splits a line into a list of string args.
 List<String> _splitLine(String line) {
   var args = line.split(' ').where((arg) {
       return arg != ' ' && arg != '';
@@ skipping 32 matching lines @@
   Future<List<String>> complete(List<String> args) => new Future.value([]);
 
   // Override in subclasses to provide command-specific execution.
   Future run(List<String> args);
 
   // Returns a list of local subcommands which match the args.
   List<Command> _matchLocal(String arg, bool preferExact) {
     var matches = new List<Command>();
     for (var child in _children) {
       if (child.name.startsWith(arg)) {
-        if (preferExact && child.name == arg) {
+        if (preferExact && ((child.name == arg) || (child.alias == arg))) {
           return [child];
         }
         matches.add(child);
       }
     }
     return matches;
   }
 
   // Returns the set of commands could be triggered by a list of
   // arguments.
@@ skipping 149 matching lines @@
   }
 
   toString() => 'RootCommand';
 }
 
 // A node in the command tree.
 abstract class Command extends _CommandBase {
   Command(this.name, List<Command> children) : super(children);
 
   final String name;
+  String alias;
+
   String get fullName {
     if (_parent is RootCommand) {
       return name;
     } else {
       Command parent = _parent;
       return '${parent.fullName} $name';
     }
   }
 
   toString() => 'Command(${name})';
 }