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

mojo/shell/connect_util.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_SHELL_CONNECT_UTIL_H_
 #define MOJO_SHELL_CONNECT_UTIL_H_
 
 #include "mojo/public/cpp/bindings/interface_ptr.h"
 #include "mojo/public/cpp/system/handle.h"
-#include "mojo/shell/identity.h"
+#include "mojo/shell/public/cpp/identity.h"
 #include "mojo/shell/public/interfaces/connector.mojom.h"
 
 namespace mojo {
 namespace shell {
 
 class Shell;
 
 ScopedMessagePipeHandle ConnectToInterfaceByName(
     Shell* shell,
     const Identity& source,
@@ skipping 11 matching lines @@
       ConnectToInterfaceByName(shell, source, target, Interface::Name_);
   ptr->Bind(InterfacePtrInfo<Interface>(std::move(service_handle), 0u));
 }
 
 template <typename Interface>
 inline void ConnectToInterface(Shell* shell,
                                const Identity& source,
                                const std::string& name,
                                InterfacePtr<Interface>* ptr) {
   ScopedMessagePipeHandle service_handle = ConnectToInterfaceByName(
-      shell, source, Identity(name, std::string(), mojom::kInheritUserID),
+      shell, source, Identity(name, mojom::kInheritUserID),
       Interface::Name_);
   ptr->Bind(InterfacePtrInfo<Interface>(std::move(service_handle), 0u));
 }
 
 }  // namespace shell
 }  // namespace mojo
 
 
 #endif  // MOJO_SHELL_CONNECT_UTIL_H_