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

components/profile_service/profile_app.h

 // Copyright 2016 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 COMPONENTS_PROFILE_SERVICE_PROFILE_APP_H_
 #define COMPONENTS_PROFILE_SERVICE_PROFILE_APP_H_
 
 #include "components/filesystem/lock_table.h"
 #include "components/leveldb/public/interfaces/leveldb.mojom.h"
 #include "components/profile_service/public/interfaces/profile.mojom.h"
@@ skipping 38 matching lines @@
   // TODO(erg): This is a temporary hack until we redo how we initialize mojo
   // applications inside of chrome in general; this system won't work once
   // ProfileApp gets put in its own sandboxed process.
   static void AssociateMojoUserIDWithProfileDir(
       const std::string& user_id,
       const base::FilePath& profile_data_dir);
 
  private:
   // |ShellClient| override:
   void Initialize(mojo::Connector* connector,
-                  const std::string& url,
-                  const std::string& user_id,
+                  const mojo::Identity& identity,
                   uint32_t id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
 
   // |InterfaceFactory<ProfileService>| implementation:
   void Create(mojo::Connection* connection,
               ProfileServiceRequest request) override;
 
   // |InterfaceFactory<LevelDBService>| implementation:
   void Create(mojo::Connection* connection,
               leveldb::LevelDBServiceRequest request) override;
 
   mojo::TracingImpl tracing_;
 
   scoped_ptr<ProfileService> profile_service_;
   mojo::BindingSet<ProfileService> profile_bindings_;
 
   scoped_ptr<leveldb::LevelDBService> leveldb_service_;
   mojo::BindingSet<leveldb::LevelDBService> leveldb_bindings_;
 
   scoped_ptr<filesystem::LockTable> lock_table_;
 
   base::FilePath profile_data_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileApp);
 };
 
 }  // namespace profile
 
 #endif  // COMPONENTS_PROFILE_SERVICE_PROFILE_APP_H_