Separate the NTP app ordering from the app list app ordering

chrome/browser/chrome_notification_types.h

Index: chrome/browser/chrome_notification_types.h
diff --git a/chrome/browser/chrome_notification_types.h b/chrome/browser/chrome_notification_types.h
index f6ecc4441a968803d7062c8e95dd2085808a09a4..67c989b147be578f86fa7aa15d21cc86b383c14e 100644
--- a/chrome/browser/chrome_notification_types.h
+++ b/chrome/browser/chrome_notification_types.h
@@ -1014,6 +1014,11 @@ enum NotificationType {
   // was moved.
   NOTIFICATION_EXTENSION_LAUNCHER_REORDERED,
 
+  // Sent when the applications in the app list have been reordered.
+  // The details, if not NoDetails, is the std::string ID of the extension that
+  // was moved.
+  NOTIFICATION_APP_LIST_REORDERED,

[sky, 2013/08/19 15:58:55]

Aren't we in the process of nuking NotificationService?
https://code.google.com/p/chromium/issues/detail?id=268984

[calamity, 2013/08/20 05:05:18]

Added AppListExtensionSortingObserver.

+
   // Sent when an app is installed and an NTP has been shown. Source is the
   // WebContents that was shown, and Details is the string ID of the extension
   // which was installed.