Register for HID device notifications on Windows.

device/hid/hid_connection_win.h

 // Copyright (c) 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.
 
 #ifndef DEVICE_HID_HID_CONNECTION_WIN_H_
 #define DEVICE_HID_HID_CONNECTION_WIN_H_
 
 #include <windows.h>
 
 #include <set>
 
 #include "base/win/scoped_handle.h"
 #include "device/hid/hid_connection.h"
 
 namespace device {
 
 struct PendingHidTransfer;
 
 class HidConnectionWin : public HidConnection {
  public:
-  explicit HidConnectionWin(const HidDeviceInfo& device_info);
+  HidConnectionWin(const HidDeviceInfo& device_info,
+                   base::win::ScopedHandle file);
 
  private:
   friend class HidServiceWin;
   friend struct PendingHidTransfer;
 
   ~HidConnectionWin();
 
   // HidConnection implementation.
   virtual void PlatformClose() override;
   virtual void PlatformRead(const ReadCallback& callback) override;
   virtual void PlatformWrite(scoped_refptr<net::IOBuffer> buffer,
                              size_t size,
                              const WriteCallback& callback) override;
   virtual void PlatformGetFeatureReport(uint8_t report_id,
                                         const ReadCallback& callback) override;
   virtual void PlatformSendFeatureReport(
       scoped_refptr<net::IOBuffer> buffer,
       size_t size,
       const WriteCallback& callback) override;
 
-  bool available() const { return file_.IsValid(); }
-
   void OnReadComplete(scoped_refptr<net::IOBuffer> buffer,
                       const ReadCallback& callback,
                       PendingHidTransfer* transfer,
                       bool signaled);
   void OnReadFeatureComplete(scoped_refptr<net::IOBuffer> buffer,
                              const ReadCallback& callback,
                              PendingHidTransfer* transfer,
                              bool signaled);
   void OnWriteComplete(const WriteCallback& callback,
                        PendingHidTransfer* transfer,
                        bool signaled);
 
   base::win::ScopedHandle file_;
 
   std::set<scoped_refptr<PendingHidTransfer> > transfers_;
 
   DISALLOW_COPY_AND_ASSIGN(HidConnectionWin);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_HID_HID_CONNECTION_WIN_H_