Add OptionsUI and its handler for multiple displays.

chrome/browser/ui/webui/options2/chromeos/display_options_handler.h

Index: chrome/browser/ui/webui/options2/chromeos/display_options_handler.h
diff --git a/chrome/browser/ui/webui/options2/chromeos/display_options_handler.h b/chrome/browser/ui/webui/options2/chromeos/display_options_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..855f8b0480bd8006857b044539ded3c3c267638d
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+++ b/chrome/browser/ui/webui/options2/chromeos/display_options_handler.h
@@ -0,0 +1,59 @@
+// 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 CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_DISPLAY_OPTIONS_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_DISPLAY_OPTIONS_HANDLER_H_
+#pragma once
+
+#include <vector>
+
+#include "chrome/browser/ui/webui/options2/options_ui2.h"
+#include "ui/aura/display_observer.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace chromeos {
+namespace options2 {
+
+// Display options overlay page UI handler.
+class DisplayOptionsHandler : public ::options2::OptionsPageUIHandler,
+                              public aura::DisplayObserver {
+ public:
+  DisplayOptionsHandler();
+  virtual ~DisplayOptionsHandler();
+
+  // OptionsPageUIHandler implementation.
+  virtual void GetLocalizedValues(DictionaryValue* localized_strings) OVERRIDE;
+  virtual void InitializeHandler() OVERRIDE;
+
+  // WebUIMessageHandler implementation.
+  virtual void RegisterMessages() OVERRIDE;
+
+  // aura::DisplayObserver implementation.
+  virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE;
+  virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
+  virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
+
+ private:
+  // Updates the display section visibility based on the current display
+  // configurations.
+  void UpdateDisplaySectionVisibility();
+
+  // Sends the current display information to the web_ui of options page.
+  void SendDisplayInfo();
+
+  // Handlers of JS messages.
+  void HandleDisplayInfo(const base::ListValue* unused_args);
+  void HandleMirroring(const base::ListValue* args);
+  void HandleDisplayLayout(const base::ListValue* args);
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayOptionsHandler);
+};
+
+}  // namespace options2
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_DISPLAY_OPTIONS_HANDLER_H_