Do not show the activity widget in ActivityManager::AddActivity

athena/activity/activity.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "athena/activity/public/activity.h"
 
 #include "athena/activity/public/activity_manager.h"
+#include "ui/views/widget/widget.h"
 
 namespace athena {
 
 // static
+void Activity::Show(Activity* activity) {
+  views::Widget* widget =
+      views::Widget::GetWidgetForNativeWindow(activity->GetWindow());
+  DCHECK(widget);
+  widget->Show();
+}
+
+// static
 void Activity::Delete(Activity* activity) {
   ActivityManager::Get()->RemoveActivity(activity);
   delete activity;
 }
 
 }  // namespace athena