Enumerate HID devices asynchronously on Windows.

device/hid/hid_service.cc

 // Copyright 2014 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 "device/hid/hid_service.h"
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 23 matching lines @@
 }
 
 HidService* HidService::GetInstance(
     scoped_refptr<base::SingleThreadTaskRunner> file_task_runner) {
   if (g_service == NULL) {
 #if defined(OS_LINUX) && defined(USE_UDEV)
     g_service = new HidServiceLinux(file_task_runner);
 #elif defined(OS_MACOSX)
     g_service = new HidServiceMac(file_task_runner);
 #elif defined(OS_WIN)
-    g_service = new HidServiceWin();
+    g_service = new HidServiceWin(file_task_runner);
 #endif
     if (g_service != nullptr) {
       base::AtExitManager::RegisterTask(base::Bind(
           &base::DeletePointer<HidService>, base::Unretained(g_service)));
     }
   }
   return g_service;
 }
 
 void HidService::SetInstanceForTest(HidService* instance) {
@@ skipping 75 matching lines @@
     }
 
     for (const GetDevicesCallback& callback : pending_enumerations_) {
       callback.Run(devices);
     }
     pending_enumerations_.clear();
   }
 }
 
 }  // namespace device