Adding Baseframework of the ResourceManager (all hooks and observers) are being put in place with a…

athena/activity/public/activity_manager_observer.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_MANAGER_OBSERVER_H_
+#define ATHENA_ACTIVITY_PUBLIC_ACTIVITY_MANAGER_OBSERVER_H_
+
+#include "athena/athena_export.h"
+
+namespace athena {
+
+class Activity;
+
+class ATHENA_EXPORT ActivityManagerObserver {
+ public:
+  virtual ~ActivityManagerObserver() {}
+
+  // Called after an |activity| got created.
+  virtual void OnActivityStarted(Activity* activity) = 0;
+
+  // Called before an |activity| gets destroyed.
+  virtual void OnActivityEnding(Activity* activity) = 0;
+};
+
+}  // namespace athena
+
+#endif  // ATHENA_ACTIVITY_PUBLIC_ACTIVITY_MANAGER_OBSERVER_H_