Added an ActivationReason parameter to ActivationChangeObserver::OnWindowActivated(...).

ui/views/controls/menu/menu_message_loop_aura.cc

Index: ui/views/controls/menu/menu_message_loop_aura.cc
diff --git a/ui/views/controls/menu/menu_message_loop_aura.cc b/ui/views/controls/menu/menu_message_loop_aura.cc
index 9ec89e9595c7bb3a0c376ccc17d2c152e034e64b..da29d9a52a518f8a2c289076a103f951ab7f3514 100644
--- a/ui/views/controls/menu/menu_message_loop_aura.cc
+++ b/ui/views/controls/menu/menu_message_loop_aura.cc
@@ -60,8 +60,10 @@ class ActivationChangeObserverImpl
   ~ActivationChangeObserverImpl() override { Cleanup(); }
 
   // aura::client::ActivationChangeObserver:
-  void OnWindowActivated(aura::Window* gained_active,
-                         aura::Window* lost_active) override {
+  void OnWindowActivated(
+      aura::client::ActivationChangeObserver::ActivationReason reason,
+      aura::Window* gained_active,
+      aura::Window* lost_active) override {
     if (!controller_->drag_in_progress())
       controller_->CancelAll();
   }