WebUSB bindings part 4

Source/modules/webusb/USBInterface.cpp

Index: Source/modules/webusb/USBInterface.cpp
diff --git a/Source/modules/webusb/USBInterface.cpp b/Source/modules/webusb/USBInterface.cpp
index 1c13bbccffb1e50de6c54073fb55cf87836bdcec..7e12e70063cc716665e815c5bf8f1d86a2cff559 100644
--- a/Source/modules/webusb/USBInterface.cpp
+++ b/Source/modules/webusb/USBInterface.cpp
@@ -6,6 +6,7 @@
 #include "modules/webusb/USBInterface.h"
 
 #include "bindings/core/v8/ExceptionState.h"
+#include "modules/webusb/USBAlternateInterface.h"
 #include "modules/webusb/USBConfiguration.h"
 
 namespace blink {
@@ -38,6 +39,14 @@ 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;