mus: Change PointerWatcher to observe all pointer events, with moves optional.

services/ui/test_wm/test_wm.cc

Index: services/ui/test_wm/test_wm.cc
diff --git a/services/ui/test_wm/test_wm.cc b/services/ui/test_wm/test_wm.cc
index c8cafa976fa9bcc152543de1258ece4f2dc3017d..840102ebbf2abb1a5818b620a438b2b09f087462 100644
--- a/services/ui/test_wm/test_wm.cc
+++ b/services/ui/test_wm/test_wm.cc
@@ -41,7 +41,8 @@ class TestWM : public shell::Service,
   void OnDidDestroyClient(ui::WindowTreeClient* client) override {
     window_tree_client_ = nullptr;
   }
-  void OnEventObserved(const ui::Event& event, ui::Window* target) override {
+  void OnPointerWatcherEvent(const ui::PointerEvent& event,
+                             ui::Window* target) override {
     // Don't care.
   }