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

components/profile_service/profile_app.cc

Index: components/profile_service/profile_app.cc
diff --git a/components/profile_service/profile_app.cc b/components/profile_service/profile_app.cc
index 5be0fd9991cfbe98c91e9e21740bb71afeb54df1..27491db5e910d27946721e9031860a493591c71b 100644
--- a/components/profile_service/profile_app.cc
+++ b/components/profile_service/profile_app.cc
@@ -36,13 +36,12 @@ void ProfileApp::AssociateMojoUserIDWithProfileDir(
 }
 
 void ProfileApp::Initialize(mojo::Connector* connector,
-                            const std::string& url,
-                            const std::string& user_id,
+                            const mojo::Identity& identity,
                             uint32_t id) {
-  tracing_.Initialize(connector, url);
+  tracing_.Initialize(connector, identity.name());
   leveldb_service_.reset(new leveldb::LevelDBServiceImpl);
 
-  auto it = g_user_id_to_data_dir.Get().find(user_id);
+  auto it = g_user_id_to_data_dir.Get().find(identity.user_id());
   DCHECK(it != g_user_id_to_data_dir.Get().end());
   profile_data_dir_ = it->second;
 }