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 69fc00f7b84226c6c1d455313877161688c2b4c8..3c9d786f8bb2bf4e03a88b6700c3f812b14dd7c7 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 OnPointerEventObserved(const ui::PointerEvent& event,
+                              ui::Window* target) override {
     // Don't care.
   }