Do not assign launch ordinals to ephemeral apps

chrome/browser/extensions/chrome_app_sorting.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_CHROME_APP_SORTING_H_
 #define CHROME_BROWSER_EXTENSIONS_CHROME_APP_SORTING_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 44 matching lines @@
   virtual syncer::StringOrdinal GetPageOrdinal(
       const std::string& extension_id) const OVERRIDE;
   virtual void SetPageOrdinal(
       const std::string& extension_id,
       const syncer::StringOrdinal& new_page_ordinal) OVERRIDE;
   virtual void ClearOrdinals(const std::string& extension_id) OVERRIDE;
   virtual int PageStringOrdinalAsInteger(
       const syncer::StringOrdinal& page_ordinal) const OVERRIDE;
   virtual syncer::StringOrdinal PageIntegerAsStringOrdinal(
       size_t page_index) OVERRIDE;
-  virtual void MarkExtensionAsHidden(const std::string& extension_id) OVERRIDE;
+  virtual void SetExtensionVisible(const std::string& extension_id,
+                                   bool visible) OVERRIDE;
 
  private:
   // The StringOrdinal is the app launch ordinal and the string is the extension
   // id.
   typedef std::multimap<
       syncer::StringOrdinal, std::string,
     syncer::StringOrdinal::LessThanFn> AppLaunchOrdinalMap;
   // The StringOrdinal is the page ordinal and the AppLaunchOrdinalMap is the
   // contents of that page.
   typedef std::map<
       syncer::StringOrdinal, AppLaunchOrdinalMap,
     syncer::StringOrdinal::LessThanFn> PageOrdinalMap;
 
   // Unit tests.
   friend class ChromeAppSortingDefaultOrdinalsBase;
   friend class ChromeAppSortingGetMinOrMaxAppLaunchOrdinalsOnPage;
   friend class ChromeAppSortingInitializeWithNoApps;
   friend class ChromeAppSortingPageOrdinalMapping;
+  friend class ChromeAppSortingSetExtensionVisible;
 
   // An enum used by GetMinOrMaxAppLaunchOrdinalsOnPage to specify which
   // value should be returned.
   enum AppLaunchOrdinalReturn {MIN_ORDINAL, MAX_ORDINAL};
 
   // Maps an app id to its ordinals.
   struct AppOrdinals {
     AppOrdinals();
     ~AppOrdinals();
 
@@ skipping 83 matching lines @@
 
   // The set of extensions that don't appear in the new tab page.
   std::set<std::string> ntp_hidden_extensions_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeAppSorting);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CHROME_APP_SORTING_H_