Track USB device interface claim state in Blink.

third_party/WebKit/Source/modules/webusb/USBConfiguration.cpp

 // 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 "modules/webusb/USBConfiguration.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "modules/webusb/USBDevice.h"
 #include "modules/webusb/USBInterface.h"
 
@@ skipping 24 matching lines @@
 }
 
 USBConfiguration::USBConfiguration(const USBDevice* device, size_t configurationIndex)
     : m_device(device)
     , m_configurationIndex(configurationIndex)
 {
     ASSERT(m_device);
     ASSERT(m_configurationIndex < m_device->info().configurations.size());
 }
 
+const USBDevice* USBConfiguration::device() const
+{
+    return m_device;
+}
+
+size_t USBConfiguration::index() const
+{
+    return m_configurationIndex;
+}
+
 const WebUSBDeviceInfo::Configuration& USBConfiguration::info() const
 {
     return m_device->info().configurations[m_configurationIndex];
 }
 
 uint8_t USBConfiguration::configurationValue() const
 {
     return info().configurationValue;
 }
 
 String USBConfiguration::configurationName() const
 {
     return info().configurationName;
 }
 
 HeapVector<Member<USBInterface>> USBConfiguration::interfaces() const
 {
     HeapVector<Member<USBInterface>> interfaces;
     for (size_t i = 0; i < info().interfaces.size(); ++i)
         interfaces.append(USBInterface::create(this, i));
     return interfaces;
 }
 
 DEFINE_TRACE(USBConfiguration)
 {
     visitor->trace(m_device);
 }
 
 } // namespace blink