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

device/usb/usb_device.cc

Index: device/usb/usb_device.cc
diff --git a/device/usb/usb_device.cc b/device/usb/usb_device.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4b9ed1e9a6ebf37e0490cb0911ce718ed7370e4a
--- /dev/null
+++ b/device/usb/usb_device.cc
@@ -0,0 +1,26 @@
+// Copyright 2015 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/usb/usb_device.h"
+
+namespace device {
+
+UsbDevice::UsbDevice(uint16 vendor_id, uint16 product_id, uint32 unique_id)
+    : vendor_id_(vendor_id), product_id_(product_id), unique_id_(unique_id) {
+}
+
+UsbDevice::~UsbDevice() {
+}
+
+void UsbDevice::CheckUsbAccess(const ResultCallback& callback) {
+  callback.Run(true);
+}
+
+// Like CheckUsbAccess but actually changes the ownership of the device node.
+void UsbDevice::RequestUsbAccess(int interface_id,
+                                 const ResultCallback& callback) {
+  callback.Run(true);
+}
+
+}  // namespace device