Implement settings in a widnow

chrome/browser/ui/settings_window_manager.h

Index: chrome/browser/ui/settings_window_manager.h
diff --git a/chrome/browser/ui/settings_window_manager.h b/chrome/browser/ui/settings_window_manager.h
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+++ b/chrome/browser/ui/settings_window_manager.h
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+// Copyright (c) 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 CHROME_BROWSER_UI_SETTINGS_WINDOW_MANAGER_H_
+#define CHROME_BROWSER_UI_SETTINGS_WINDOW_MANAGER_H_
+
+#include <map>
+#include <string>
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/sessions/session_id.h"
+
+class Profile;
+
+namespace chrome {
+
+// Class for managing settings windows when --enable-settings-window is enabled.
+// TODO(stevenjb): Remove flag comment if enabled by default.
+
+class SettingsWindowManager {
+ public:
+  static SettingsWindowManager* GetInstance();
+
+  // Show an existing settings window for |profile| or create a new one, and
+  // navigate to |sub_page|.
+  void ShowForProfile(Profile* profile, const std::string& sub_page);
+
+ private:
+  friend struct DefaultSingletonTraits<SettingsWindowManager>;
+  typedef std::map<Profile*, SessionID::id_type> ProfileSessionMap;
+
+  SettingsWindowManager();
+  ~SettingsWindowManager();
+
+  ProfileSessionMap settings_session_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(SettingsWindowManager);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_UI_SETTINGS_WINDOW_MANAGER_H_