Introduce an extension parameter which is used to customize the extension. It's available for exter…

extensions/browser/external_provider_interface.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 EXTENSIONS_BROWSER_EXTERNAL_PROVIDER_INTERFACE_H_
 #define EXTENSIONS_BROWSER_EXTERNAL_PROVIDER_INTERFACE_H_
 
 #include <vector>
 
 #include "base/memory/linked_ptr.h"
@@ skipping 28 matching lines @@
         const base::FilePath& path,
         Manifest::Location location,
         int creation_flags,
         bool mark_acknowledged) = 0;
 
     // Return true if the extension install will proceed.  Install might not
     // proceed if the extension is already installed from a higher priority
     // location.
     virtual bool OnExternalExtensionUpdateUrlFound(
         const std::string& id,
+        const std::string& install_parameter,
         const GURL& update_url,
         Manifest::Location location,
         int creation_flags,
         bool mark_acknowledged) = 0;
 
     // Called after all the external extensions have been reported
     // through the above two methods. |provider| is a pointer to the
     // provider that is now ready (typically this), and the
     // implementation of OnExternalProviderReady() should be able to
     // safely assert that provider->IsReady().
@@ skipping 30 matching lines @@
   // from its source.
   virtual bool IsReady() const = 0;
 };
 
 typedef std::vector<linked_ptr<ExternalProviderInterface> >
     ProviderCollection;
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTERNAL_PROVIDER_INTERFACE_H_