Add GetUsbKeyCode dev interface for Pepper key events

webkit/plugins/ppapi/event_conversion.cc

Index: webkit/plugins/ppapi/event_conversion.cc
diff --git a/webkit/plugins/ppapi/event_conversion.cc b/webkit/plugins/ppapi/event_conversion.cc
index d78ad3916a76032e6e2f0a6811b127bfe40c3348..4b1f2ddecdd22ddce890879e70176728b0e2e0bd 100644
--- a/webkit/plugins/ppapi/event_conversion.cc
+++ b/webkit/plugins/ppapi/event_conversion.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -81,6 +81,9 @@ void AppendKeyEvent(const WebInputEvent& event,
   InputEventData result = GetEventWithCommonFieldsAndType(event);
   result.event_modifiers = key_event.modifiers;
   result.key_code = key_event.windowsKeyCode;
+  // TODO(garykac): Platform-specific code to convert from
+  // |key_event.nativeKeyCode| to USB key code.
+  result.usb_key_code = 0;
   result_events->push_back(result);
 }