Make virtual keyboard work on supervised user creation

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index b9d4e76195be1e4c8e1880c39ea16594eebd751b..2021fcd77ac570409d17afed707f0a58fdbcd984 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -1217,6 +1217,16 @@ void Shell::OnSessionStateChanged(session_manager::SessionState state) {
   // multiple times (e.g. initial login vs. multiprofile add session).
   if (state == session_manager::SessionState::ACTIVE) {
     InitializeShelf();
+  }
+  // Recreates keyboard on user profile change, to refresh keyboard
+  // extensions with the new profile and the extensions call proper IME.
+  // |LOGGED_IN_NOT_ACTIVE| is needed so that the virtual keyboard works on
+  // supervised user creation. crbug.com/712873
+  // |ACTIVE| is also needed for guest user workflow.
+  if ((state == session_manager::SessionState::LOGGED_IN_NOT_ACTIVE ||
+       state == session_manager::SessionState::ACTIVE) &&
+      keyboard::IsKeyboardEnabled() &&
+      !keyboard::KeyboardController::GetInstance()) {
     if (GetAshConfig() != Config::MASH) {
       // Recreate the keyboard after initial login and after multiprofile login.
       CreateKeyboard();