1 files changed, 30 insertions, 0 deletions
diff --git a/chrome/browser/extensions/api/storage/settings_observer.h b/chrome/browser/extensions/api/storage/settings_observer.h
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+++ b/chrome/browser/extensions/api/storage/settings_observer.h
@@ -0,0 +1,30 @@
+// Copyright (c) 2011 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_EXTENSIONS_API_STORAGE_SETTINGS_OBSERVER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_OBSERVER_H_
+
+#include "base/observer_list_threadsafe.h"
+#include "chrome/browser/extensions/api/storage/settings_namespace.h"
+
+namespace extensions {
+
+// Interface for classes that listen to changes to extension settings.
+class SettingsObserver {
+ public:
+  // Called when a list of settings have changed for an extension.
+  virtual void OnSettingsChanged(
+      const std::string& extension_id,
+      settings_namespace::Namespace settings_namespace,
+      const std::string& changes_json) = 0;
+
+  virtual ~SettingsObserver() {}
+};
+
+typedef ObserverListThreadSafe<SettingsObserver>
+    SettingsObserverList;
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_OBSERVER_H_