Add a instance groups to Connect(), and introduce an Identity struct.

mojo/services/network/network_service_delegate.h

 // 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.
 
 #ifndef MOJO_SERVICES_NETWORK_NETWORK_SERVICE_DELEGATE_H_
 #define MOJO_SERVICES_NETWORK_NETWORK_SERVICE_DELEGATE_H_
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/threading/thread.h"
@@ skipping 17 matching lines @@
                                public InterfaceFactory<URLLoaderFactory> {
  public:
   NetworkServiceDelegate();
   ~NetworkServiceDelegate() override;
 
   void AddObserver(NetworkServiceDelegateObserver* observer);
   void RemoveObserver(NetworkServiceDelegateObserver* observer);
 
  private:
   // mojo::ShellClient implementation.
-  void Initialize(Connector* connector, const std::string& url,
-                  const std::string& user_id, uint32_t id) override;
+  void Initialize(Connector* connector, const Identity& identity,
+                  uint32_t id) override;
   bool AcceptConnection(Connection* connection) override;
 
   // InterfaceFactory<NetworkService> implementation.
   void Create(Connection* connection,
               InterfaceRequest<NetworkService> request) override;
 
   // InterfaceFactory<CookieStore> implementation.
   void Create(Connection* connection,
               InterfaceRequest<CookieStore> request) override;
 
@@ skipping 16 matching lines @@
   scoped_ptr<NetworkContext> context_;
 
   mojo::MessageLoopRefFactory ref_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkServiceDelegate);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_NETWORK_NETWORK_SERVICE_DELEGATE_H_