cros: Convert SystemTrayDelegate::ManageBluetoothDevices to mojo for mash

ash/common/system/tray/system_tray_controller.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_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_CONTROLLER_H_
 #define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/public/interfaces/system_tray.mojom.h"
 #include "base/compiler_specific.h"
@@ skipping 15 matching lines @@
 class ASH_EXPORT SystemTrayController
     : NON_EXPORTED_BASE(public mojom::SystemTray) {
  public:
   SystemTrayController();
   ~SystemTrayController() override;
 
   base::HourClockType hour_clock_type() const { return hour_clock_type_; }
 
   // Wrappers around the mojom::SystemTrayClient interface.
   void ShowSettings();
+  void ShowBluetoothSettings();
+  // TODO(crbug.com/660043): ShowBluetoothPairingDialog() goes here.
   void ShowDateSettings();
   void ShowSetTimeDialog();
   void ShowDisplaySettings();
   void ShowPowerSettings();
   void ShowChromeSlow();
   void ShowIMESettings();
   void ShowHelp();
   void ShowAccessibilityHelp();
   void ShowAccessibilitySettings();
   void ShowPaletteHelp();
@@ skipping 12 matching lines @@
 
   // mojom::SystemTray overrides. Public for testing.
   void SetClient(mojom::SystemTrayClientPtr client) override;
   void SetPrimaryTrayEnabled(bool enabled) override;
   void SetPrimaryTrayVisible(bool visible) override;
   void SetUse24HourClock(bool use_24_hour) override;
   void ShowUpdateIcon(mojom::UpdateSeverity severity,
                       bool factory_reset_required) override;
 
  private:
-  // Client interface in chrome browser. Only bound on Chrome OS.
+  // Client interface in chrome browser. May be null in tests.
   mojom::SystemTrayClientPtr system_tray_client_;
 
   // Bindings for the SystemTray interface.
   mojo::BindingSet<mojom::SystemTray> bindings_;
 
   // The type of clock hour display: 12 or 24 hour.
   base::HourClockType hour_clock_type_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayController);
 };
 
 }  // namspace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_CONTROLLER_H_