Refactor notifications of chrome/browser/webdata

chrome/browser/webdata/web_data_service_observer.h

+// Copyright (c) 2013 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_WEBDATA_WEB_DATA_SERVICE_OBSERVER_H_
+#define CHROME_BROWSER_WEBDATA_WEB_DATA_SERVICE_OBSERVER_H_
+
+#include "chrome/browser/webdata/autofill_change.h"
+
+// TODO(kaiwang): Split this into an Autofill-specific part and the rest once we
+// split the Autofill parts of WebDataService off.
+class WebDataServiceObserver {
+ public:
+  // Called whenever Autofill entries are changed.
+  virtual void AutofillEntriesChanged(const AutofillChangeList& changes) {}
+
+  // Called when an AutofillProfile has been added/removed/updated in the
+  // WebDatabase.
+  virtual void AutofillProfileChanged(const AutofillProfileChange& change) {}
+
+  // Called when multiple Autofill entries have been modified by Sync.
+  virtual void AutofillMultipleChanged() {}
+
+  // Called whenever the web database service has finished loading the web
+  // database.
+  virtual void WebDatabaseLoaded() {}
+
+ protected:
+  virtual ~WebDataServiceObserver() {}
+};
+
+#endif  // CHROME_BROWSER_WEBDATA_WEB_DATA_SERVICE_OBSERVER_H_