Adds TraySessionLengthLimitTest to ash_unittests.

ash/test/ash_test_base.cc

 // Copyright (c) 2012 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 "ash/test/ash_test_base.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/display/display_controller.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/shell/toplevel_window.h"
 #include "ash/test/ash_test_helper.h"
 #include "ash/test/display_manager_test_api.h"
 #include "ash/test/test_session_state_delegate.h"
 #include "ash/test/test_shell_delegate.h"
+#include "ash/test/test_system_tray_delegate.h"
 #include "ash/wm/coordinate_conversion.h"
 #include "ash/wm/window_positioner.h"
 #include "base/command_line.h"
 #include "content/public/test/web_contents_tester.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/event_generator.h"
 #include "ui/aura/test/test_window_delegate.h"
@@ skipping 250 matching lines @@
 }
 
 void AshTestBase::RunAllPendingInMessageLoop() {
   ash_test_helper_->RunAllPendingInMessageLoop();
 }
 
 TestScreenshotDelegate* AshTestBase::GetScreenshotDelegate() {
   return ash_test_helper_->test_screenshot_delegate();
 }
 
+TestSystemTrayDelegate* AshTestBase::GetSystemTrayDelegate() {
+  return static_cast<TestSystemTrayDelegate*>(
+      Shell::GetInstance()->system_tray_delegate());
+}
+
 void AshTestBase::SetSessionStarted(bool session_started) {
   ash_test_helper_->test_shell_delegate()->test_session_state_delegate()->
       SetActiveUserSessionStarted(session_started);
 }
 
 void AshTestBase::SetUserLoggedIn(bool user_logged_in) {
   ash_test_helper_->test_shell_delegate()->test_session_state_delegate()->
       SetHasActiveUser(user_logged_in);
 }
 
@@ skipping 35 matching lines @@
 
 void AshTestBase::UnblockUserSession() {
   Shell::GetInstance()->session_state_delegate()->UnlockScreen();
   SetSessionStarted(true);
   SetUserAddingScreenRunning(false);
 }
 
 
 }  // namespace test
 }  // namespace ash