WebUSB bindings part 4

Source/modules/webusb/USBInterface.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 "config.h"
 #include "modules/webusb/USBInterface.h"
 
 #include "bindings/core/v8/ExceptionState.h"
+#include "modules/webusb/USBAlternateInterface.h"
 #include "modules/webusb/USBConfiguration.h"
 
 namespace blink {
 
 USBInterface* USBInterface::create(const USBConfiguration* configuration, size_t interfaceIndex)
 {
     return new USBInterface(configuration, interfaceIndex);
 }
 
 USBInterface* USBInterface::create(const USBConfiguration* configuration, size_t interfaceNumber, ExceptionState& exceptionState)
@@ skipping 12 matching lines @@
 {
     ASSERT(m_configuration);
     ASSERT(m_interfaceIndex < m_configuration->info().interfaces.size());
 }
 
 const WebUSBDeviceInfo::Interface& USBInterface::info() const
 {
     return m_configuration->info().interfaces[m_interfaceIndex];
 }
 
+HeapVector<Member<USBAlternateInterface>> USBInterface::alternates() const
+{
+    HeapVector<Member<USBAlternateInterface>> alternates;
+    for (size_t i = 0; i < info().alternates.size(); ++i)
+        alternates.append(USBAlternateInterface::create(this, i));
+    return alternates;
+}
+
 uint8_t USBInterface::interfaceNumber() const
 {
     return info().interfaceNumber;
 }
 
 DEFINE_TRACE(USBInterface)
 {
     visitor->trace(m_configuration);
 }
 
 } // namespace blink