Move mojo and mojom from mojo/public/dart to mojo/dart/packages

mojo/dart/packages/mojom/lib/src/commands/mojom_command.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 library mojom.command;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:args/args.dart';
@@ skipping 55 matching lines @@
     }
   }
 
   String toString() {
     String dart = makeRelative(Platform.executable);
     String script = makeRelative(path.fromUri(Platform.script));
     String globals = globalResults.arguments.join(" ");
     return "$dart $script $globals";
   }
 }