A11y: Introduce High Contrast Mode and Screen Magnifier to ubar tray.

ash/magnifier/magnifier_constants.h

Index: ash/magnifier/magnifier_constants.h
diff --git a/ash/magnifier/magnifier_constants.h b/ash/magnifier/magnifier_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..4ca4c892e97b3b01cd6f9e7039fa1e1906547a23
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+++ b/ash/magnifier/magnifier_constants.h
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+// 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.
+
+#ifndef ASH_MAGNIFIER_MAGNIFIER_CONSTANTS_H_
+#define ASH_MAGNIFIER_MAGNIFIER_CONSTANTS_H_
+
+namespace ash {
+
+enum MagnifierType {
+  MAGNIFIER_OFF,
+  MAGNIFIER_FULL,
+  MAGNIFIER_PARTIAL,
+};
+
+}  // namespace ash
+
+#endif  // ASH_MAGNIFIER_MAGNIFIER_CONSTANTS_H_