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

content/common/mojo/mojo_shell_connection_impl.cc

 // 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.
 
 #include "content/common/mojo/mojo_shell_connection_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 77 matching lines @@
     DLOG(ERROR) << "Unable to connect to the Mojo shell.";
     delete this;
     lazy_tls_ptr.Pointer()->Set(nullptr);
     return;
   }
   shell_connection_.reset(new mojo::ShellConnection(this, std::move(request)));
   shell_connection_->WaitForInitialize();
 }
 
 void MojoShellConnectionImpl::Initialize(mojo::Connector* connector,
-                                         const std::string& url,
-                                         const std::string& user_id,
+                                         const mojo::Identity& identity,
                                          uint32_t id) {
   initialized_ = true;
 }
 
 bool MojoShellConnectionImpl::AcceptConnection(mojo::Connection* connection) {
   bool found = false;
   for (auto listener : listeners_)
     found |= listener->AcceptConnection(connection);
   return found;
 }
@@ skipping 27 matching lines @@
 // static
 void MojoShellConnection::Destroy() {
   // This joins the shell controller thread.
   delete Get();
   lazy_tls_ptr.Pointer()->Set(nullptr);
 }
 
 MojoShellConnection::~MojoShellConnection() {}
 
 }  // namespace content