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diff --git a/chromium/ash/display/display_change_observer_chromeos.h b/chromium/ash/display/display_change_observer_chromeos.h
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+++ b/chromium/ash/display/display_change_observer_chromeos.h
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+// Copyright 2013 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_DISPLAY_DISPLAY_CHANGE_OBSERVER_CHROMEOS_H
+#define ASH_DISPLAY_DISPLAY_CHANGE_OBSERVER_CHROMEOS_H
+
+#include "ash/ash_export.h"
+#include "ash/shell_observer.h"
+#include "base/basictypes.h"
+#include "chromeos/display/output_configurator.h"
+
+namespace ash {
+namespace internal {
+
+struct Resolution;
+
+// An object that observes changes in display configuration and
+// update DisplayManagers.
+class DisplayChangeObserver
+    : public chromeos::OutputConfigurator::StateController,
+      public chromeos::OutputConfigurator::Observer,
+      public ShellObserver {
+ public:
+  // Returns the resolution list.
+  ASH_EXPORT static std::vector<Resolution> GetResolutionList(
+      const chromeos::OutputConfigurator::OutputSnapshot& output);
+
+  DisplayChangeObserver();
+  virtual ~DisplayChangeObserver();
+
+  // chromeos::OutputConfigurator::StateController overrides:
+  virtual chromeos::OutputState GetStateForDisplayIds(
+      const std::vector<int64>& outputs) const OVERRIDE;
+  virtual bool GetResolutionForDisplayId(int64 display_id,
+                                         int* width,
+                                         int* height) const OVERRIDE;
+
+  // Overriden from chromeos::OutputConfigurator::Observer:
+  virtual void OnDisplayModeChanged(
+      const std::vector<chromeos::OutputConfigurator::OutputSnapshot>& outputs)
+      OVERRIDE;
+
+  // Overriden from ShellObserver:
+  virtual void OnAppTerminating() OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DisplayChangeObserver);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_DISPLAY_AURA_DISPLAY_CHANGE_OBSERVER_CHROMEOS_H