Wires up WmShellMus::Add/RemovePointerWatcher

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 8c2c2430f1d068a99bcf26ac49710e98f19c7345..67ea7ca4d048a0f56241c4f3e56616ca6825be8d 100644
--- a/ash/mus/window_manager.h
+++ b/ash/mus/window_manager.h
@@ -27,6 +27,10 @@ namespace shell {
 class Connector;
 }
 
+namespace views {
+class PointerWatcherEventRouter;
+}
+
 namespace ash {
 namespace mus {
 
@@ -123,6 +127,9 @@ class WindowManager : public ui::WindowManagerDelegate,
 
   ui::WindowManagerClient* window_manager_client_ = nullptr;
 
+  std::unique_ptr<views::PointerWatcherEventRouter>
+      pointer_watcher_event_router_;
+
   std::unique_ptr<ShadowController> shadow_controller_;
 
   std::set<std::unique_ptr<RootWindowController>> root_window_controllers_;