Disable firewall check. It takes signifficant time, need to be on FILE thread.

chrome/browser/local_discovery/service_discovery_shared_client.cc

 // 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.
 
 #include "chrome/browser/local_discovery/service_discovery_shared_client.h"
 
 #include "content/public/browser/browser_thread.h"
 
 #if defined(OS_WIN)
 #include "base/files/file_path.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/timer/elapsed_timer.h"
 #include "chrome/browser/local_discovery/service_discovery_client_utility.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/firewall_manager_win.h"
 #endif  // OS_WIN
 
 #if defined(OS_MACOSX)
 #include "chrome/browser/local_discovery/service_discovery_client_mac_factory.h"
 #endif
 
 #if defined(ENABLE_MDNS)
 #include "chrome/browser/local_discovery/service_discovery_client_mdns.h"
 #endif  // ENABLE_MDNS
 
 namespace {
 
 #if defined(OS_WIN)
-bool IsFirewallReady() {
+void ReportFirewallStats() {
   base::FilePath exe_path;
   if (!PathService::Get(base::FILE_EXE, &exe_path))
-    return false;
+    return;
   base::ElapsedTimer timer;
   scoped_ptr<installer::FirewallManager> manager =
       installer::FirewallManager::Create(BrowserDistribution::GetDistribution(),
                                          exe_path);
   if (!manager)
-    return false;
+    return;
   bool is_ready = manager->CanUseLocalPorts();
   UMA_HISTOGRAM_TIMES("LocalDiscovery.FirewallAccessTime", timer.Elapsed());
   UMA_HISTOGRAM_BOOLEAN("LocalDiscovery.IsFirewallReady", is_ready);
-  return is_ready;
 }
 #endif  // OS_WIN
 
 }  // namespace
 
 
 namespace local_discovery {
 
 using content::BrowserThread;
 
@@ skipping 18 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   if (g_service_discovery_client)
     return g_service_discovery_client;
 
 #if defined(OS_MACOSX)
   return ServiceDiscoveryClientMacFactory::CreateInstance();
 #else
 
 #if defined(OS_WIN)
-  static bool is_firewall_ready = IsFirewallReady();
-  if (!is_firewall_ready) {
-    // TODO(vitalybuka): Remove after we find what to do with firewall for
-    // user-level installs. crbug.com/366408
-    return new ServiceDiscoveryClientUtility();
-  }
+  static bool reported =
+      BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
+                              base::Bind(&ReportFirewallStats));
+  // TODO(vitalybuka): Switch to |ServiceDiscoveryClientMdns| after we find what
+  // to do with firewall for user-level installs. crbug.com/366408
+  return new ServiceDiscoveryClientUtility();
 #endif  // OS_WIN
   return new ServiceDiscoveryClientMdns();
 #endif
 }
 
 #else
 
 scoped_refptr<ServiceDiscoverySharedClient>
     ServiceDiscoverySharedClient::GetInstance() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   NOTIMPLEMENTED();
   return NULL;
 }
 
 #endif  // ENABLE_MDNS
 
 }  // namespace local_discovery