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

athena/activity/activity_manager_impl.h

Index: athena/activity/activity_manager_impl.h
diff --git a/athena/activity/activity_manager_impl.h b/athena/activity/activity_manager_impl.h
index 2a109fd670cb4533fbfa33018829e623b954cbfc..35e627ca48da5e410ef9c44056816345c38c1b09 100644
--- a/athena/activity/activity_manager_impl.h
+++ b/athena/activity/activity_manager_impl.h
@@ -7,9 +7,12 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "base/observer_list.h"
 
 namespace athena {
 
+class ActivityManagerObserver;
+
 class ActivityManagerImpl : public ActivityManager {
  public:
   ActivityManagerImpl();
@@ -21,10 +24,14 @@ class ActivityManagerImpl : public ActivityManager {
   virtual void AddActivity(Activity* activity) OVERRIDE;
   virtual void RemoveActivity(Activity* activity) OVERRIDE;
   virtual void UpdateActivity(Activity* activity) OVERRIDE;
+  virtual void AddObserver(ActivityManagerObserver* observer) OVERRIDE;
+  virtual void RemoveObserver(ActivityManagerObserver* observer) OVERRIDE;
 
  private:
   std::vector<Activity*> activities_;
 
+  ObserverList<ActivityManagerObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(ActivityManagerImpl);
 };