Splits shelf alignment and auto-hide behavior into two values, one

chrome/browser/prefs/pref_service_observer.h

Index: chrome/browser/prefs/pref_service_observer.h
diff --git a/chrome/browser/prefs/pref_service_observer.h b/chrome/browser/prefs/pref_service_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..5e8e0986d12500562dcb75a7e31bfca57f524d7b
--- /dev/null
+++ b/chrome/browser/prefs/pref_service_observer.h
@@ -0,0 +1,17 @@
+// 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_PREFS_PREF_SERVICE_OBSERVER_H_
+#define CHROME_BROWSER_PREFS_PREF_SERVICE_OBSERVER_H_
+
+class PrefServiceObserver {
+ public:
+  // Invoked when PrefService::HasSycned() changes.
+  virtual void OnHasSyncedChanged() = 0;
+
+ protected:
+  virtual ~PrefServiceObserver() {}
+};
+
+#endif  // CHROME_BROWSER_PREFS_PREF_SERVICE_OBSERVER_H_