Modal window in user session not blocks user adding screen.

ash/wm/event_client_impl.cc

Index: ash/wm/event_client_impl.cc
diff --git a/ash/wm/event_client_impl.cc b/ash/wm/event_client_impl.cc
index 9e121d168b815a414fcb913eac237f9e59196d08..fcdc1b425d382c948e31b0135fff8e61d105c5ee 100644
--- a/ash/wm/event_client_impl.cc
+++ b/ash/wm/event_client_impl.cc
@@ -23,10 +23,7 @@ bool EventClientImpl::CanProcessEventsWithinSubtree(
   const aura::RootWindow* root_window = window ? window->GetRootWindow() : NULL;
   if (!root_window)
     return true;
-  ash::SessionStateDelegate* state_delegate =
-      Shell::GetInstance()->session_state_delegate();
-  if (!state_delegate->IsActiveUserSessionStarted() ||
-      state_delegate->IsScreenLocked()) {
+  if (Shell::GetInstance()->session_state_delegate()->IsUserSessionBlocked()) {
     const aura::Window* lock_screen_containers = Shell::GetContainer(
         root_window,
         kShellWindowId_LockScreenContainersContainer);