Separate the NTP app ordering from the app list app ordering

chrome/browser/extensions/extension_sorting.cc

Index: chrome/browser/extensions/extension_sorting.cc
diff --git a/chrome/browser/extensions/extension_sorting.cc b/chrome/browser/extensions/extension_sorting.cc
index fa17dacd6c6856f5815e19b85d67583c5cc3f4ac..e615461663b52d867df2787ec2fb394fc1a92f65 100644
--- a/chrome/browser/extensions/extension_sorting.cc
+++ b/chrome/browser/extensions/extension_sorting.cc
@@ -623,3 +623,15 @@ size_t ExtensionSorting::CountItemsVisibleOnNtp(
   }
   return result;
 }
+
+void ExtensionSorting::GetOrderedExtensionIds(
+    extensions::ExtensionIdList* out) const {
+  for (PageOrdinalMap::const_iterator page_it = ntp_ordinal_map_.begin();
+       page_it != ntp_ordinal_map_.end(); ++page_it) {
+    const AppLaunchOrdinalMap& page = page_it->second;
+    for (AppLaunchOrdinalMap::const_iterator app_launch_it = page.begin();
+         app_launch_it != page.end(); ++app_launch_it) {
+      out->push_back(app_launch_it->second);
+    }
+  }
+}