mus: Forward user activity from window server to detector.

ash/mus/bridge/wm_shell_mus.cc

Index: ash/mus/bridge/wm_shell_mus.cc
diff --git a/ash/mus/bridge/wm_shell_mus.cc b/ash/mus/bridge/wm_shell_mus.cc
index d7c5b61eb781f2dc36ecf8150dab16786fd44f63..6eb353daecd26ca0cede126dff603ed6a3aa6a8b 100644
--- a/ash/mus/bridge/wm_shell_mus.cc
+++ b/ash/mus/bridge/wm_shell_mus.cc
@@ -27,12 +27,15 @@
 #include "ash/mus/drag_window_resizer.h"
 #include "ash/mus/keyboard_ui_mus.h"
 #include "ash/mus/root_window_controller.h"
+#include "ash/mus/user_activity_forwarder.h"
 #include "ash/mus/window_manager.h"
 #include "ash/shared/immersive_fullscreen_controller.h"
 #include "base/memory/ptr_util.h"
 #include "components/user_manager/user_info_impl.h"
 #include "ui/aura/mus/window_tree_client.h"
 #include "ui/aura/window.h"
+#include "ui/base/user_activity/user_activity_detector.h"
+#include "ui/chromeos/user_activity_power_manager_notifier.h"
 #include "ui/display/manager/managed_display_info.h"
 #include "ui/display/screen.h"
 #include "ui/views/mus/pointer_watcher_event_router.h"
@@ -111,7 +114,14 @@ WmShellMus::WmShellMus(
     : WmShell(std::move(shell_delegate)),
       window_manager_(window_manager),
       pointer_watcher_event_router_(pointer_watcher_event_router),
-      session_state_delegate_(new SessionStateDelegateStub) {
+      session_state_delegate_(new SessionStateDelegateStub),
+      user_activity_detector_(base::MakeUnique<ui::UserActivityDetector>()),
+      user_activity_notifier_(
+          base::MakeUnique<ui::UserActivityPowerManagerNotifier>(
+              user_activity_detector_.get())),
+      user_activity_forwarder_(base::MakeUnique<UserActivityForwarder>(
+          delegate()->GetShellConnector(),
+          user_activity_detector_.get())) {
   WmShell::Set(this);
 
   uint16_t accelerator_namespace_id = 0u;