WIP: Eliminate event.target() usage from TrayEventFilter

ui/views/mus/window_manager_connection.cc

Index: ui/views/mus/window_manager_connection.cc
diff --git a/ui/views/mus/window_manager_connection.cc b/ui/views/mus/window_manager_connection.cc
index f52771ad4d01ac89d58e7b4cfd6f50dcf773cec5..4e7e4e44b8ccf8c12d01518c49a4a5c0dfb119cc 100644
--- a/ui/views/mus/window_manager_connection.cc
+++ b/ui/views/mus/window_manager_connection.cc
@@ -142,9 +142,19 @@ void WindowManagerConnection::OnEmbed(mus::Window* root) {}
 void WindowManagerConnection::OnConnectionLost(
     mus::WindowTreeConnection* connection) {}
 
-void WindowManagerConnection::OnEventObserved(const ui::Event& event) {
+void WindowManagerConnection::OnEventObserved(const ui::Event& event,
+                                              mus::Window* target) {
   if (!event.IsLocatedEvent())
     return;
+  Widget* target_widget = nullptr;
+  if (target) {
+    mus::Window* root = target->GetRoot();
+    target_widget = NativeWidgetMus::GetWidgetForWindow(root);
+    LOG(ERROR) << "JAMES target_widget " << target_widget->GetName();
+  } else {
+    LOG(ERROR) << "JAMES no target";
+  }
+
   // The mojo input events type converter uses the event root_location field
   // to store screen coordinates. Screen coordinates really should be returned
   // separately. See http://crbug.com/608547
@@ -152,11 +162,11 @@ void WindowManagerConnection::OnEventObserved(const ui::Event& event) {
   if (event.type() == ui::ET_MOUSE_PRESSED) {
     FOR_EACH_OBSERVER(
         PointerWatcher, pointer_watchers_,
-        OnMousePressed(*event.AsMouseEvent(), location_in_screen));
+        OnMousePressed(*event.AsMouseEvent(), location_in_screen, target_widget));
   } else if (event.type() == ui::ET_TOUCH_PRESSED) {
     FOR_EACH_OBSERVER(
         PointerWatcher, pointer_watchers_,
-        OnTouchPressed(*event.AsTouchEvent(), location_in_screen));
+        OnTouchPressed(*event.AsTouchEvent(), location_in_screen, target_widget));
   }
 }