Wires up InputDeviceClient for mash/mushrome

ash/mus/window_manager.h

Index: ash/mus/window_manager.h
diff --git a/ash/mus/window_manager.h b/ash/mus/window_manager.h
index b424d381f881887c126302e102ca2c841284c003..4ac49da18bbf10d9c6ebb7fa2fd6e0546ddbb3fa 100644
--- a/ash/mus/window_manager.h
+++ b/ash/mus/window_manager.h
@@ -32,6 +32,10 @@ namespace service_manager {
 class Connector;
 }
 
+namespace ui {
+class InputDeviceClient;
+}
+
 namespace views {
 class PointerWatcherEventRouter;
 }
@@ -225,6 +229,8 @@ class WindowManager : public aura::WindowManagerDelegate,
   struct DragState;
   std::unique_ptr<DragState> drag_state_;
 
+  std::unique_ptr<ui::InputDeviceClient> input_device_client_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowManager);
 };