contacts: Add ContactManager.

chrome/browser/chromeos/contacts/contact_manager_observer.h

+// Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_CONTACTS_CONTACT_MANAGER_OBSERVER_H_
+#define CHROME_BROWSER_CHROMEOS_CONTACTS_CONTACT_MANAGER_OBSERVER_H_
+
+class Profile;
+
+namespace contacts {
+
+class ContactManager;
+
+// Interface for classes that need to observe changes to ContactManager.
+class ContactManagerObserver {
+ public:
+  ContactManagerObserver() {}
+  virtual ~ContactManagerObserver() {}
+
+  // Called when |profile|'s contacts have been updated.
+  virtual void OnContactsUpdated(Profile* profile) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ContactManagerObserver);
+};
+
+}  // namespace contacts
+
+#endif  // CHROME_BROWSER_CHROMEOS_CONTACTS_CONTACT_MANAGER_OBSERVER_H_