Check USB device path access when prompting users to select a device.

device/usb/usb_device_impl.h

 // 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.
 
 #ifndef DEVICE_USB_USB_DEVICE_IMPL_H_
 #define DEVICE_USB_USB_DEVICE_IMPL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 14 matching lines @@
 class UsbDeviceHandleImpl;
 class UsbContext;
 
 typedef libusb_device* PlatformUsbDevice;
 typedef libusb_config_descriptor* PlatformUsbConfigDescriptor;
 
 class UsbDeviceImpl : public UsbDevice {
  public:
 // UsbDevice implementation:
 #if defined(OS_CHROMEOS)
-  void RequestUsbAccess(
-      int interface_id,
-      const base::Callback<void(bool success)>& callback) override;
+  // Only overridden on Chrome OS.
+  void CheckUsbAccess(const ResultCallback& callback) override;
+  void RequestUsbAccess(int interface_id,
+                        const ResultCallback& callback) override;
 #endif  // OS_CHROMEOS
   scoped_refptr<UsbDeviceHandle> Open() override;
   bool Close(scoped_refptr<UsbDeviceHandle> handle) override;
   const UsbConfigDescriptor* GetConfiguration() override;
   bool GetManufacturer(base::string16* manufacturer) override;
   bool GetProduct(base::string16* product) override;
   bool GetSerialNumber(base::string16* serial_number) override;
 
  protected:
   friend class UsbServiceImpl;
@@ skipping 51 matching lines @@
 
   // Reference to the UI thread for permission-broker calls.
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbDeviceImpl);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_USB_USB_DEVICE_IMPL_H_