Add WebUSB bindings and client interface [part 1]

public/platform/modules/webusb/WebUSBDeviceFilter.h

Index: public/platform/modules/webusb/WebUSBDeviceFilter.h
diff --git a/public/platform/modules/webusb/WebUSBDeviceFilter.h b/public/platform/modules/webusb/WebUSBDeviceFilter.h
new file mode 100644
index 0000000000000000000000000000000000000000..117cd1c49150b77fc02ae8d791e9248fd4988a61
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+++ b/public/platform/modules/webusb/WebUSBDeviceFilter.h
@@ -0,0 +1,34 @@
+// 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 WebUSBDeviceFilter_h
+#define WebUSBDeviceFilter_h
+
+#include "public/platform/WebCommon.h"
+
+namespace blink {
+
+// Filter which specifies what devices the API consumer wants to enumerate.
+// Properties which are not present in a filter should be treated as wildcards.
+struct WebUSBDeviceFilter {
+    WebUSBDeviceFilter() {}
+
+    // Members corresponding to USBDeviceFilter properties specified in the IDL.
+    uint16_t vendorID;
+    uint16_t productID;
+    uint8_t classCode;
+    uint8_t subclassCode;
+    uint8_t protocolCode;
+
+    // Presence flags for each of the above properties.
+    bool hasVendorID : 1;
+    bool hasProductID : 1;
+    bool hasClassCode : 1;
+    bool hasSubclassCode : 1;
+    bool hasProtocolCode : 1;
+};
+
+} // namespace blink
+
+#endif // WebUSBDeviceFilter_h