Separate the NTP app ordering from the app list app ordering

chrome/browser/extensions/extension_prefs.h

Index: chrome/browser/extensions/extension_prefs.h
diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
index 4f12266bcac8a3910d95514b8b327b9f4cbe21d3..c20665a2af851c5c5abd22be826e65b0570891ad 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -17,6 +17,7 @@
 #include "chrome/browser/extensions/extension_prefs_scope.h"
 #include "chrome/browser/extensions/extension_scoped_prefs.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
+#include "chrome/browser/ui/app_list/app_list_extension_ordering.h"
 #include "chrome/common/extensions/extension.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "extensions/common/url_pattern_set.h"
@@ -498,6 +499,11 @@ class ExtensionPrefs : public ContentSettingsStore::Observer,
     return extension_sorting_.get();
   }
 
+  // The ordering of apps in the app list.
+  AppListExtensionOrdering* app_list_extension_ordering() const {
+    return app_list_extension_ordering_.get();
+  }
+
   // Describes the URLs that are able to install extensions. See
   // prefs::kExtensionAllowedInstallSites for more information.
   URLPatternSet GetAllowedInstallSites();
@@ -646,6 +652,8 @@ class ExtensionPrefs : public ContentSettingsStore::Observer,
   // properties.
   scoped_ptr<ExtensionSorting> extension_sorting_;
 
+  scoped_ptr<AppListExtensionOrdering> app_list_extension_ordering_;
+
   scoped_refptr<ContentSettingsStore> content_settings_store_;
 
   scoped_ptr<TimeProvider> time_provider_;