NTP: Use the store as the last thumbnail in case we have no apps installed....

chrome/browser/extensions/extensions_service.h

 // Copyright (c) 2010 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_EXTENSIONS_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 333 matching lines @@
   void ReportExtensionLoadError(const FilePath& extension_path,
                                 const std::string& error,
                                 NotificationType type,
                                 bool be_noisy);
 
   // NotificationObserver
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
+  // Whether there are any apps installed.
+  bool HasApps();
+
  private:
   virtual ~ExtensionsService();
   friend class ChromeThread;
   friend class DeleteTask<ExtensionsService>;
 
   // Clear all persistent data that may have been stored by the extension.
   void ClearExtensionData(const GURL& extension_url);
 
   // Look up an extension by ID, optionally including either or both of enabled
   // and disabled extensions.
@@ skipping 185 matching lines @@
 
   // A map of all external extension providers.
   typedef std::map<Extension::Location,
                    linked_ptr<ExternalExtensionProvider> > ProviderMap;
   ProviderMap external_extension_providers_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionsServiceBackend);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_