Do not assign launch ordinals to ephemeral apps

extensions/browser/app_sorting.h

Index: extensions/browser/app_sorting.h
diff --git a/extensions/browser/app_sorting.h b/extensions/browser/app_sorting.h
index 75edf637477917e565459ecd6d4ac2248f51e17a..2761fef8e80d772eebea9dea75153dd320bb4874 100644
--- a/extensions/browser/app_sorting.h
+++ b/extensions/browser/app_sorting.h
@@ -109,8 +109,9 @@ class AppSorting {
   virtual syncer::StringOrdinal PageIntegerAsStringOrdinal(
       size_t page_index) = 0;
 
-  // Hidden extensions don't appear in the new tab page.
-  virtual void MarkExtensionAsHidden(const std::string& extension_id) = 0;
+  // Sets whether the extension should be visible in the new tab page.

[tapted, 2014/07/17 04:29:46]

Perhaps, 

// Hides an extension from the new tab page, or makes a previously hidden
// extension visible.

[tmdiep, 2014/07/17 05:48:57]

Done.

+  virtual void SetExtensionVisible(const std::string& extension_id,
+                                   bool visible) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AppSorting);