Do not show the activity widget in ActivityManager::AddActivity

athena/activity/public/activity_view_manager.h

-// 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.
-
-#ifndef ATHENA_ACTIVITY_PUBLIC_ACTIVITY_VIEW_MANAGER_H_
-#define ATHENA_ACTIVITY_PUBLIC_ACTIVITY_VIEW_MANAGER_H_
-
-#include "athena/athena_export.h"
-
-namespace athena {
-
-class Activity;
-
-// Manages the views for the activities.
-class ATHENA_EXPORT ActivityViewManager {
- public:
-  static ActivityViewManager* Create();
-  static ActivityViewManager* Get();
-  static void Shutdown();
-
-  virtual ~ActivityViewManager() {}
-
-  // Adds/Removes a task.
-  virtual void AddActivity(Activity* task) = 0;
-  virtual void RemoveActivity(Activity* task) = 0;
-
-  // Updates the UI when the task color/title changes.
-  virtual void UpdateActivity(Activity* task) = 0;
-};
-
-}  // namespace athena
-
-#endif  // ATHENA_ACTIVITY_PUBLIC_ACTIVITY_VIEW_MANAGER_H_