Add WebUSB bindings and client interface

public/platform/modules/webusb/WebUSBTransferInfo.h

Index: public/platform/modules/webusb/WebUSBTransferInfo.h
diff --git a/public/platform/modules/webusb/WebUSBTransferInfo.h b/public/platform/modules/webusb/WebUSBTransferInfo.h
new file mode 100644
index 0000000000000000000000000000000000000000..aeaf39da88cf4a9ce5b0608bfd5b17c36cd897f1
--- /dev/null
+++ b/public/platform/modules/webusb/WebUSBTransferInfo.h
@@ -0,0 +1,36 @@
+// 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.
+
+#ifndef WebUSBTransferInfo_h
+#define WebUSBTransferInfo_h
+
+#include "public/platform/WebVector.h"
+
+namespace blink {
+
+// Information about a completed USB transfer.
+struct WebUSBTransferInfo {
+    enum Status {
+        StatusOk,
+        StatusStalled,
+        StatusOverflow,

[Reilly Grant (use Gerrit), 2015/07/23 23:24:08]

Let's keep this consistent with the WebUSB API and call it "babble."

[Ken Rockot(use gerrit already), 2015/07/28 22:30:38]

Done. Also changed StatusStalled -> StatusStall

+    };
+
+    WebUSBTransferInfo()
+        : status(StatusOk)
+    {
+    }
+
+    Status status;
+
+    // Data received, if this is an inbound transfer.
+    WebVector<uint8_t> data;
+
+    // Number of bytes sent if this is an outbound transfer.
+    uint32_t bytesSent;

[Reilly Grant (use Gerrit), 2015/07/23 23:24:08]

bytesWritten to be consistent as well.

[Ken Rockot(use gerrit already), 2015/07/28 22:30:38]

Done.

+};
+
+} // namespace blink
+
+#endif // WebUSBTransferInfo_h