Run OAuth token handle check upon user pod selction.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/shell.h"
@@ skipping 1218 matching lines @@
 }
 
 void SigninScreenHandler::HandleUpdateOfflineLogin(bool offline_login_active) {
   offline_login_active_ = offline_login_active;
 }
 
 void SigninScreenHandler::HandleFocusPod(const std::string& user_id) {
   SetUserInputMethod(user_id, ime_state_.get());
   WallpaperManager::Get()->SetUserWallpaperDelayed(user_id);
   ScreenlockBridge::Get()->SetFocusedUser(user_id);
+  if (delegate_)
+    delegate_->CheckUserStatus(user_id);

[Nikita (slow), 2015/04/07 11:18:10]

FocusPod maybe called multiple times per user and can easily result in sending
too much requests w/o necessity.

As discussed offline, I'll file a separate bug regarding throttling requests.

   if (!test_focus_pod_callback_.is_null())
     test_focus_pod_callback_.Run();
 }
 
 void SigninScreenHandler::HandleGetPublicSessionKeyboardLayouts(
     const std::string& user_id,
     const std::string& locale) {
   GetKeyboardLayoutsForLocale(
       base::Bind(&SigninScreenHandler::SendPublicSessionKeyboardLayouts,
                  weak_factory_.GetWeakPtr(),
@@ skipping 134 matching lines @@
   return gaia_screen_handler_->frame_error();
 }
 
 void SigninScreenHandler::OnCapsLockChanged(bool enabled) {
   caps_lock_enabled_ = enabled;
   if (page_is_ready())
     CallJS("login.AccountPickerScreen.setCapsLockState", caps_lock_enabled_);
 }
 
 }  // namespace chromeos