contacts: Add GoogleContactStore.

chrome/browser/chromeos/contacts/contact_store_observer.h

Index: chrome/browser/chromeos/contacts/contact_store_observer.h
diff --git a/chrome/browser/chromeos/contacts/contact_store_observer.h b/chrome/browser/chromeos/contacts/contact_store_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..dc387ed4144bc87234629f71c9c25952662ba7ad
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+++ b/chrome/browser/chromeos/contacts/contact_store_observer.h
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+// 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_STORE_OBSERVER_H_
+#define CHROME_BROWSER_CHROMEOS_CONTACTS_CONTACT_STORE_OBSERVER_H_
+
+#include "base/basictypes.h"
+
+namespace contacts {
+
+class ContactStore;
+
+// Interface for observing changes to a ContactStore.
+class ContactStoreObserver {
+ public:
+  ContactStoreObserver() {}
+  virtual ~ContactStoreObserver() {}
+
+  // Called when the contacts stored within a ContactStore are updated.
+  virtual void OnContactsUpdated(ContactStore* store) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ContactStoreObserver);
+};
+
+}  // namespace contacts
+
+#endif  // CHROME_BROWSER_CHROMEOS_CONTACTS_CONTACT_STORE_OBSERVER_H_