Separate the NTP app ordering from the app list app ordering

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 8448b6addd044feb3c267f1608d706d6fe35c1dc..daf0e5f4801429dd95ce75fabefb8c13ae3c469c 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -408,6 +408,7 @@ ExtensionService::ExtensionService(Profile* profile,
   // Set this as the ExtensionService for extension sorting to ensure it
   // cause syncs if required.
   extension_prefs_->extension_sorting()->SetExtensionService(this);
+  extension_prefs_->app_list_extension_sorting()->SetExtensionService(this);
 
   is_first_run_ = !extension_prefs_->SetAlertSystemFirstRun();
 
@@ -1304,6 +1305,7 @@ syncer::SyncError ExtensionService::ProcessSyncChanges(
   }
 
   extension_prefs()->extension_sorting()->FixNTPOrdinalCollisions();
+  extension_prefs()->app_list_extension_sorting()->FixSyncCollisions();
 
   return syncer::SyncError();
 }
@@ -1323,7 +1325,9 @@ extensions::AppSyncData ExtensionService::GetAppSyncData(
       IsIncognitoEnabled(extension.id()),
       extension_prefs_->extension_sorting()->GetAppLaunchOrdinal(
           extension.id()),
-      extension_prefs_->extension_sorting()->GetPageOrdinal(extension.id()));
+      extension_prefs_->extension_sorting()->GetPageOrdinal(extension.id()),
+      extension_prefs_->app_list_extension_sorting()->
+          GetAppListOrdinalFromPrefs(extension.id()));
 }
 
 std::vector<extensions::ExtensionSyncData>
@@ -1389,6 +1393,10 @@ bool ExtensionService::ProcessAppSyncData(
         id,
         app_sync_data.page_ordinal());
   }
+  if (app_sync_data.app_list_ordinal().IsValid()) {
+    extension_prefs_->app_list_extension_sorting()->
+        UpdateAppListOrdinalFromSync(id, app_sync_data.app_list_ordinal());
+  }
 
   if (!ProcessExtensionSyncDataHelper(app_sync_data.extension_sync_data(),
                                       syncer::APPS)) {
@@ -2035,6 +2043,10 @@ void ExtensionService::AddExtension(const Extension* extension) {
       }
       extension_prefs_->extension_sorting()->EnsureValidOrdinals(
           extension->id(), syncer::StringOrdinal());
+      AppListExtensionSorting* ordering =
+          extension_prefs_->app_list_extension_sorting();
+      if (!ordering->Contains(extension->id()))
+        ordering->InsertAtBack(extension->id());
     }
 
     extensions_.Insert(extension);