Implement High Contrast mode for Chrome OS

ash/high_contrast/high_contrast_controller.h

Index: ash/high_contrast/high_contrast_controller.h
diff --git a/ash/high_contrast/high_contrast_controller.h b/ash/high_contrast/high_contrast_controller.h
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+++ b/ash/high_contrast/high_contrast_controller.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_HIGH_CONTRAST_HIGH_CONTRAST_CONTROLLER_H_
+#define ASH_HIGH_CONTRAST_HIGH_CONTRAST_CONTROLLER_H_
+#pragma once
+
+#include "ash/ash_export.h"
+#include "base/basictypes.h"
+
+namespace aura {
+class RootWindow;
+}
+
+namespace ash {
+
+class ASH_EXPORT HighContrastController {
+ public:
+  HighContrastController();
+
+  ~HighContrastController() {}
+
+  void SetEnabled(bool enabled);
+
+ private:
+  aura::RootWindow* root_window_;
+
+  bool enabled_;
+
+  DISALLOW_COPY_AND_ASSIGN(HighContrastController);
+};
+
+}  // namespace ash
+
+#endif  // ASH_HIGH_CONTRAST_HIGH_CONTRAST_CONTROLLER_H_