WebUSB bindings part 3

Source/modules/webusb/USBConfiguration.cpp

Index: Source/modules/webusb/USBConfiguration.cpp
diff --git a/Source/modules/webusb/USBConfiguration.cpp b/Source/modules/webusb/USBConfiguration.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d08a98e301388c30356c900cad1cb6da8ac0d34c
--- /dev/null
+++ b/Source/modules/webusb/USBConfiguration.cpp
@@ -0,0 +1,65 @@
+// 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/USBConfiguration.h"
+
+#include "bindings/core/v8/ExceptionState.h"
+#include "modules/webusb/USBDevice.h"
+#include "modules/webusb/USBInterface.h"
+
+namespace blink {
+
+USBConfiguration* USBConfiguration::create(const USBDevice* device, size_t configurationIndex)
+{
+    return new USBConfiguration(device, configurationIndex);
+}
+
+USBConfiguration* USBConfiguration::create(const USBDevice* device, size_t configurationValue, ExceptionState& exceptionState)
+{
+    for (size_t i = 0; i < device->info().configurations.size(); ++i) {
+        if (device->info().configurations[i].configurationValue == configurationValue)
+            return new USBConfiguration(device, i);
+    }
+    exceptionState.throwRangeError("Invalid configuration value.");
+    return nullptr;
+}
+
+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 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