Convert TrayAccessibility to wm common types

ui/chromeos/accessibility_types.h

-// Copyright 2014 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.
-
-#ifndef UI_CHROMEOS_ACCESSIBILITY_TYPES_H_
-#define UI_CHROMEOS_ACCESSIBILITY_TYPES_H_
-
-namespace ui {
-
-enum AccessibilityNotificationVisibility {
-  A11Y_NOTIFICATION_NONE,
-  A11Y_NOTIFICATION_SHOW,
-};
-
-enum AccessibilityAlert {
-  A11Y_ALERT_NONE,
-  A11Y_ALERT_WINDOW_NEEDED,
-  A11Y_ALERT_WINDOW_OVERVIEW_MODE_ENTERED
-};
-
-// Note: Do not change these values; UMA and prefs depend on them.
-enum MagnifierType {
-  MAGNIFIER_FULL    = 1,
-  MAGNIFIER_PARTIAL = 2,
-};
-
-const int kMaxMagnifierType = 2;
-
-const MagnifierType kDefaultMagnifierType = MAGNIFIER_FULL;
-
-// Factor of magnification scale. For example, when this value is 1.189, scale
-// value will be changed x1.000, x1.189, x1.414, x1.681, x2.000, ...
-// Note: this value is 2.0 ^ (1 / 4).
-const float kMagnificationScaleFactor = 1.18920712f;
-
-}  // namespace ui
-
-#endif  // UI_CHROMEOS_ACCESSIBILITY_TYPES_H_