Add a command line switch "--disable-background-networking", to be used in...

chrome/browser/extensions/extension_updater.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_updater.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/logging.h"
@@ skipping 774 matching lines @@
 
         continue;
       }
     }
     result.push_back(i);
   }
   return result;
 }
 
 void ExtensionUpdater::StartUpdateCheck(ManifestFetchData* fetch_data) {
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kDisableBackgroundNetworking))
+    return;
+
   std::deque<ManifestFetchData*>::const_iterator i;
   for (i = manifests_pending_.begin(); i != manifests_pending_.end(); i++) {
     if (fetch_data->full_url() == (*i)->full_url()) {
       // This url is already scheduled to be fetched.
       delete fetch_data;
       return;
     }
   }
 
   if (manifest_fetcher_.get() != NULL) {
@@ skipping 35 matching lines @@
     extension_fetcher_.reset(
         URLFetcher::Create(kExtensionFetcherId, url, URLFetcher::GET, this));
     extension_fetcher_->set_request_context(
         Profile::GetDefaultRequestContext());
     extension_fetcher_->set_load_flags(net::LOAD_DO_NOT_SEND_COOKIES |
                                        net::LOAD_DO_NOT_SAVE_COOKIES);
     extension_fetcher_->Start();
     current_extension_fetch_ = ExtensionFetch(id, url, hash, version);
   }
 }