Calc USB scancodes for key events (linux only for now)

webkit/plugins/ppapi/usb_key_code_conversion.h

Index: webkit/plugins/ppapi/usb_key_code_conversion.h
diff --git a/webkit/plugins/ppapi/usb_key_code_conversion.h b/webkit/plugins/ppapi/usb_key_code_conversion.h
new file mode 100644
index 0000000000000000000000000000000000000000..fc3da163c2c0f7ad85caabb4f6a853de4f27bbcf
--- /dev/null
+++ b/webkit/plugins/ppapi/usb_key_code_conversion.h
@@ -0,0 +1,27 @@
+// Copyright (c) 2012 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 WEBKIT_PLUGINS_PPAPI_USB_KEY_CODE_CONVERSION_H_
+#define WEBKIT_PLUGINS_PPAPI_USB_KEY_CODE_CONVERSION_H_
+
+#include "ppapi/c/pp_stdint.h"
+
+namespace WebKit {
+class WebKeyboardEvent;
+}  // namespace WebKit
+
+namespace webkit {
+namespace ppapi {
+
+// Returns a 32-bit "USB Key Code" for the key identifier by the supplied
+// WebKeyboardEvent. The supplied event must be a KeyDown or KeyUp.
+// The code consists of the USB Page (in the high-order 16-bit word) and
+// USB Usage Id of the key.  If no translation can be performed then zero
+// is returned.
+uint32_t UsbKeyCodeForKeyboardEvent(const WebKit::WebKeyboardEvent& key_event);
+
+}  // namespace ppapi
+}  // namespace webkit
+
+#endif  // WEBKIT_PLUGINS_PPAPI_USB_KEY_CODE_CONVERSION_H_