Add GetUsbKeyCode dev interface for Pepper key events

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_input_event.h

 // Copyright (c) 2011 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 NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_INPUT_EVENT_H_
 #define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_INPUT_EVENT_H_
 
 #include "native_client/src/include/nacl_macros.h"
 #include "native_client/src/shared/ppapi_proxy/input_event_data.h"
 #include "native_client/src/shared/ppapi_proxy/plugin_resource.h"
@@ skipping 28 matching lines @@
   PP_InputEvent_MouseButton GetMouseButton() const;
   PP_Point GetMousePosition() const;
   int32_t GetMouseClickCount() const;
   PP_Point GetMouseMovement() const;
 
   PP_FloatPoint GetWheelDelta() const;
   PP_FloatPoint GetWheelTicks() const;
   PP_Bool GetWheelScrollByPage() const;
 
   uint32_t GetKeyCode() const;
+  uint32_t GetUsbScanCode_Dev() const;
   PP_Var GetCharacterText() const;
 
  private:
   IMPLEMENT_RESOURCE(PluginInputEvent);
   NACL_DISALLOW_COPY_AND_ASSIGN(PluginInputEvent);
 
   InputEventData input_event_data_;
   PP_Var character_text_;  // Undefined if this is not a character event.
 };
 
 }  // namespace ppapi_proxy
 
 #endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_INPUT_EVENT_H_