Add configuration and interface permission checks to DeviceImpl.

device/usb/usb_device_handle.h

Index: device/usb/usb_device_handle.h
diff --git a/device/usb/usb_device_handle.h b/device/usb/usb_device_handle.h
index 0597378e1c399476d0f837d8c6caf4cbbf075ca3..23d2fd5c7b84e6582d9efd057cf60ece10504ce1 100644
--- a/device/usb/usb_device_handle.h
+++ b/device/usb/usb_device_handle.h
@@ -90,6 +90,11 @@ class UsbDeviceHandle : public base::RefCountedThreadSafe<UsbDeviceHandle> {
                                unsigned int timeout,
                                const TransferCallback& callback) = 0;
 
+  // Gets the interface containing |endpoint_address|. Returns false if no
+  // claimed interface contains that endpoint.
+  virtual bool FindInterfaceByEndpoint(uint8_t endpoint_address,
+                                       uint8_t* interface_number) = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<UsbDeviceHandle>;