chromeos: Move files in //ash/common to //ash, part 1

ash/common/system/update/tray_update_unittest.cc

-// Copyright 2016 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/common/system/update/tray_update.h"
-
-#include "ash/common/system/tray/system_tray.h"
-#include "ash/common/system/tray/system_tray_controller.h"
-#include "ash/common/test/ash_test.h"
-#include "ash/common/wm_shell.h"
-#include "ash/public/interfaces/update.mojom.h"
-
-namespace ash {
-
-using TrayUpdateTest = AshTest;
-
-// Tests that the update icon becomes visible when an update becomes
-// available.
-TEST_F(TrayUpdateTest, VisibilityAfterUpdate) {
-  TrayUpdate* tray_update = GetPrimarySystemTray()->tray_update();
-
-  // The system starts with no update pending, so the icon isn't visible.
-  EXPECT_FALSE(tray_update->tray_view()->visible());
-
-  // Simulate an update.
-  WmShell::Get()->system_tray_controller()->ShowUpdateIcon(
-      mojom::UpdateSeverity::LOW, false);
-
-  // Tray item is now visible.
-  EXPECT_TRUE(tray_update->tray_view()->visible());
-}
-
-}  // namespace ash