ash: Instantiate UserActivityForwarder for --mus.

ash/shell.cc

 // 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.
 
 #include "ash/shell.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 966 matching lines @@
 
   lock_state_controller_ =
       base::MakeUnique<LockStateController>(shutdown_controller_.get());
   power_button_controller_.reset(
       new PowerButtonController(lock_state_controller_.get()));
   // Pass the initial display state to PowerButtonController.
   power_button_controller_->OnDisplayModeChanged(
       display_configurator_->cached_displays());
 
   // The connector is unavailable in some tests.
-  if (config == Config::MASH && shell_delegate_->GetShellConnector()) {
+  if ((config == Config::MASH || config == Config::MUS) &&

[Daniel Erat, 2017/05/04 23:06:53]

would you recommend != Config::CLASSIC here? i'm just thinking of the case where
we decide to add yet another /m[aeiou]sh?/ config that uses ws.

[sadrul, 2017/05/04 23:09:48]

Maybe we should use aura::Env::Mode::MUS for this sort of thing (i.e. as long as
we are using mus, we would want this, regardless of which mus-config we are
using)?

[Daniel Erat, 2017/05/04 23:58:00]

sure, that seems even better. thanks!

+      shell_delegate_->GetShellConnector()) {
     ui::mojom::UserActivityMonitorPtr user_activity_monitor;
     shell_delegate_->GetShellConnector()->BindInterface(ui::mojom::kServiceName,
                                                         &user_activity_monitor);
     user_activity_forwarder_ = base::MakeUnique<aura::UserActivityForwarder>(
         std::move(user_activity_monitor), user_activity_detector_.get());
   }
 
   drag_drop_controller_.reset(new DragDropController);
   // |screenshot_controller_| needs to be created (and prepended as a
   // pre-target handler) at this point, because |mouse_cursor_filter_| needs to
@@ skipping 244 matching lines @@
 void Shell::OnPrefServiceInitialized(
     std::unique_ptr<::PrefService> pref_service) {
   if (!instance_)
     return;
   // |pref_service_| is null if can't connect to Chrome (as happens when
   // running mash outside of chrome --mash and chrome isn't built).
   pref_service_ = std::move(pref_service);
 }
 
 }  // namespace ash