Add DartPackage annotation to all mojo_services mojoms

mojo/services/network/public/interfaces/web_socket.mojom

 // Copyright 2014 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.
 
+[DartPackage="mojo_services"]
 module mojo;
 
 import "mojo/public/interfaces/network/network_error.mojom";
 
 interface WebSocket {
   enum MessageType {
     CONTINUATION,
     TEXT,
     BINARY
   };
@@ skipping 35 matching lines @@
   DidFail(string message);
 
   DidClose(bool was_clean, uint16 code, string reason);
 
   // Blink has 3 extra methods that we don't implement, because they are used
   // for the inspector:
   // didStartOpeningHandshake
   // didFinishOpeningHandshake
   // didStartClosingHandshake
 };