[cros] Define session_manager component with SessionManager base class

chrome/browser/chromeos/login/ui/user_adding_screen.cc

Index: chrome/browser/chromeos/login/ui/user_adding_screen.cc
diff --git a/chrome/browser/chromeos/login/ui/user_adding_screen.cc b/chrome/browser/chromeos/login/ui/user_adding_screen.cc
index 172417d3a62e05d76e9ef2eeb1b6c67d398d1321..ecbc4638f714949217b98ae0f6920005c189c068 100644
--- a/chrome/browser/chromeos/login/ui/user_adding_screen.cc
+++ b/chrome/browser/chromeos/login/ui/user_adding_screen.cc
@@ -9,8 +9,10 @@
 #include "base/bind.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/login/helper.h"
 #include "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
+#include "components/session_manager/core/session_manager.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
@@ -47,6 +49,9 @@ void UserAddingScreenImpl::Start() {
   display_host_->StartUserAdding(
       base::Bind(&UserAddingScreenImpl::OnDisplayHostCompletion,
                  base::Unretained(this)));
+
+  g_browser_process->platform_part()->SessionManager()->SetSessionState(
+      session_manager::SESSION_STATE_LOGIN_SECONDARY);
   FOR_EACH_OBSERVER(Observer, observers_, OnUserAddingStarted());
 }
 
@@ -73,6 +78,9 @@ void UserAddingScreenImpl::RemoveObserver(Observer* observer) {
 void UserAddingScreenImpl::OnDisplayHostCompletion() {
   CHECK(IsRunning());
   display_host_ = NULL;
+
+  g_browser_process->platform_part()->SessionManager()->SetSessionState(
+      session_manager::SESSION_STATE_ACTIVE);
   FOR_EACH_OBSERVER(Observer, observers_, OnUserAddingFinished());
 }