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

services/navigation/view_impl.cc

Index: services/navigation/view_impl.cc
diff --git a/services/navigation/view_impl.cc b/services/navigation/view_impl.cc
index 9a85fec040dd468aeb3d1e46b69f5b49aaa8d505..a58fda43a9df899bd5e1cfdf13cc8e2f63992f1a 100644
--- a/services/navigation/view_impl.cc
+++ b/services/navigation/view_impl.cc
@@ -280,7 +280,8 @@ void ViewImpl::OnEmbed(ui::Window* root) {
 }
 
 void ViewImpl::OnDidDestroyClient(ui::WindowTreeClient* client) {}
-void ViewImpl::OnEventObserved(const ui::Event& event, ui::Window* target) {}
+void ViewImpl::OnPointerWatcherEvent(const ui::PointerEvent& event,
+                                     ui::Window* target) {}
 
 views::View* ViewImpl::GetContentsView() {
   return web_view_;