Add WebUSB bindings and client interface

Source/modules/webusb/USBEndpoint.cpp

Index: Source/modules/webusb/USBEndpoint.cpp
diff --git a/Source/modules/webusb/USBEndpoint.cpp b/Source/modules/webusb/USBEndpoint.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..07ba40fea916cae1f92147a6e0795f6071ac79c6
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+++ b/Source/modules/webusb/USBEndpoint.cpp
@@ -0,0 +1,99 @@
+// 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/USBEndpoint.h"
+
+#include "bindings/core/v8/ExceptionState.h"
+#include "modules/webusb/USBAlternateInterface.h"
+#include "public/platform/modules/webusb/WebUSBDevice.h"
+
+namespace blink {
+
+namespace {
+
+String convertDirection(const WebUSBDevice::TransferDirection& direction)
+{
+    switch (direction) {
+    case WebUSBDevice::TransferDirectionIn:
+        return "in";
+    case WebUSBDevice::TransferDirectionOut:
+        return "out";
+    default:
+        ASSERT_NOT_REACHED();
+        return "";
+    }
+}
+
+String convertType(const WebUSBDeviceInfo::Endpoint::Type& type)
+{
+    switch (type) {
+    case WebUSBDeviceInfo::Endpoint::TypeBulk:
+        return "bulk";
+    case WebUSBDeviceInfo::Endpoint::TypeInterrupt:
+        return "interrupt";
+    case WebUSBDeviceInfo::Endpoint::TypeIsochronous:
+        return "isochronous";
+    default:
+        ASSERT_NOT_REACHED();
+        return "";
+    }
+}
+
+} // namespace
+
+// static
+USBEndpoint* USBEndpoint::create(const USBAlternateInterface* alternate, size_t endpointIndex)
+{
+    return new USBEndpoint(alternate, endpointIndex);
+}
+
+// static
+USBEndpoint* USBEndpoint::create(const USBAlternateInterface* alternate, size_t endpointIndex, ExceptionState& exceptionState)
+{
+    if (endpointIndex < alternate->info().endpoints.size())
+        return new USBEndpoint(alternate, endpointIndex);
+    exceptionState.throwRangeError("Invalid endpoint index.");
+    return nullptr;
+}
+
+USBEndpoint::USBEndpoint(const USBAlternateInterface* alternate, size_t endpointIndex)
+    : m_alternate(alternate)
+    , m_endpointIndex(endpointIndex)
+{
+}
+
+const WebUSBDeviceInfo::Endpoint& USBEndpoint::info() const
+{
+    const WebUSBDeviceInfo::AlternateInterface& alternateInfo = m_alternate->info();
+    ASSERT(m_endpointIndex < alternateInfo.endpoints.size());
+    return alternateInfo.endpoints[m_endpointIndex];
+}
+
+uint8_t USBEndpoint::endpointNumber() const
+{
+    return info().endpointNumber;
+}
+
+String USBEndpoint::direction() const
+{
+    return convertDirection(info().direction);
+}
+
+String USBEndpoint::type() const
+{
+    return convertType(info().type);
+}
+
+unsigned USBEndpoint::packetSize() const
+{
+    return info().packetSize;
+}
+
+DEFINE_TRACE(USBEndpoint)
+{
+    visitor->trace(m_alternate);
+}
+
+} // namespace blink