mustash: Connect ash system tray "show settings" items to chrome over mojo

chrome/browser/ui/ash/system_tray_common.h

 // Copyright 2016 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_ASH_SYSTEM_TRAY_COMMON_H_
 #define CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_COMMON_H_
 
+#include <string>
+
 #include "base/macros.h"
 
 // System tray code shared between classic ash SystemTrayDelegateChromeos and
 // mustash SystemTrayClient.
 class SystemTrayCommon {
  public:
+  static const char kDisplaySettingsSubPageName[];
+  static const char kDisplayOverscanSettingsSubPageName[];
+
+  // Shows general settings UI.
+  static void ShowSettings();
+
   // Shows the settings related to date, timezone etc.
   static void ShowDateSettings();
 
+  // Shows settings related to multiple displays.
+  static void ShowDisplaySettings();
+
+  // Shows the page that lets you disable performance tracing.
+  static void ShowChromeSlow();
+
+  // Shows settings related to input methods.
+  static void ShowIMESettings();
+
+  // Shows help.
+  static void ShowHelp();
+
+  // Show accessibility help.
+  static void ShowAccessibilityHelp();
+
+  // Show the settings related to accessibility.
+  static void ShowAccessibilitySettings();
+
+  // Shows the help center article for the stylus tool palette.
+  static void ShowPaletteHelp();
+
+  // Shows the settings related to the stylus tool palette.
+  static void ShowPaletteSettings();
+
+  // Shows information about public account mode.
+  static void ShowPublicAccountInfo();
+
+  // Shows UI for changing proxy settings.
+  static void ShowProxySettings();
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(SystemTrayCommon);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_COMMON_H_