Start supporting some transfers in the new Windows USB backend

This patch starts adding support for opening USB devices and issuing
requests to them when using the new Windows USB backend. Only non-
composite devices are supported currently as enumerating the device
paths for composite devices is more complex.

This has been tested with a WebLight which is a non-composite device
that only requires control transfers.

Bug: 637404
Change-Id: Ib792896435106bd03b3d5743608be44a22d4b153
Reviewed-on: https://chromium-review.googlesource.com/834887
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525253}

device/usb/BUILD.gn

@@ -97,7 +97,15 @@ static_library("usb") {
   }
 
   if (is_win) {
-    libs = [ "setupapi.lib" ]
+    sources += [
+      "scoped_winusb_handle.cc",
+      "scoped_winusb_handle.h",
+    ]
+
+    libs = [
+      "setupapi.lib",
+      "winusb.lib",
+    ]
   }
 
   if (is_android || is_chromeos || is_linux) {

device/usb/scoped_winusb_handle.cc

@@ -0,0 +1,16 @@
+// Copyright 2017 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 "device/usb/scoped_winusb_handle.h"
+
+#include <windows.h>
+#include <winusb.h>
+
+namespace device {
+
+bool WinUsbHandleTraits::CloseHandle(Handle handle) {
+  return WinUsb_Free(handle) == TRUE;
+}
+
+}  // namespace device

device/usb/scoped_winusb_handle.h

@@ -0,0 +1,38 @@
+// Copyright 2017 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.
+
+#ifndef DEVICE_USB_SCOPED_WINUSB_HANDLE_H_
+#define DEVICE_USB_SCOPED_WINUSB_HANDLE_H_
+
+#include "base/win/scoped_handle.h"
+
+extern "C" {
+typedef void* WINUSB_INTERFACE_HANDLE;
+}
+
+namespace device {
+
+class WinUsbHandleTraits {
+ public:
+  using Handle = WINUSB_INTERFACE_HANDLE;
+
+  static bool CloseHandle(Handle handle);
+
+  static bool IsHandleValid(Handle handle) {
+    return handle != nullptr && handle != INVALID_HANDLE_VALUE;
+  }
+
+  static Handle NullHandle() { return nullptr; }
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(WinUsbHandleTraits);
+};
+
+using ScopedWinUsbHandle =
+    base::win::GenericScopedHandle<WinUsbHandleTraits,
+                                   base::win::DummyVerifierTraits>;
+
+}  // namespace device
+
+#endif  // DEVICE_USB_SCOPED_WINUSB_HANDLE_H_