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

ash/mus/system_tray_delegate_mus.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 ASH_MUS_SYSTEM_TRAY_DELEGATE_MUS_H_
 #define ASH_MUS_SYSTEM_TRAY_DELEGATE_MUS_H_
 
 #include "ash/common/system/tray/default_system_tray_delegate.h"
 #include "ash/public/interfaces/system_tray.mojom.h"
 #include "base/i18n/time_formatting.h"
@@ skipping 12 matching lines @@
 // TODO: Support all methods in SystemTrayDelegate. http://crbug.com/647412.
 class SystemTrayDelegateMus : public DefaultSystemTrayDelegate,
                               public mojom::SystemTray {
  public:
   explicit SystemTrayDelegateMus(shell::Connector* connector);
   ~SystemTrayDelegateMus() override;
 
   static SystemTrayDelegateMus* Get();
 
  private:
-  // Connects or reconnects the |system_tray_client_| interface.
-  void ConnectToSystemTrayClient();
+  // Connects or reconnects to the mojom::SystemTrayClient interface and returns
+  // the interface pointer.
+  mojom::SystemTrayClient* ConnectToSystemTrayClient();
 
   // Handles errors on the |system_tray_client_| interface connection.
   void OnClientConnectionError();
 
   // SystemTrayDelegate:
   base::HourClockType GetHourClockType() const override;
+  void ShowSettings() override;
   void ShowDateSettings() override;
+  void ShowNetworkSettingsForGuid(const std::string& guid) override;
+  void ShowDisplaySettings() override;
+  void ShowPowerSettings() override;
+  void ShowChromeSlow() override;
+  void ShowIMESettings() override;
+  void ShowHelp() override;
+  void ShowAccessibilityHelp() override;
+  void ShowAccessibilitySettings() override;
+  void ShowPaletteHelp() override;
+  void ShowPaletteSettings() override;
+  void ShowPublicAccountInfo() override;
+  void ShowEnterpriseInfo() override;
+  void ShowProxySettings() override;
 
   // mojom::SystemTray:
   void SetUse24HourClock(bool use_24_hour) override;
 
   // May be null in unit tests.
   shell::Connector* connector_;
 
   // Client interface in chrome browser.
   mojom::SystemTrayClientPtr system_tray_client_;
 
   // 12 or 24 hour display.
   base::HourClockType hour_clock_type_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegateMus);
 };
 
 }  // namespace ash
 
 #endif  // ASH_MUS_SYSTEM_TRAY_DELEGATE_MUS_H_