Add GetUsbKeyCode dev interface for Pepper key events

ppapi/cpp/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 PPAPI_CPP_INPUT_EVENT_H_
 #define PPAPI_CPP_INPUT_EVENT_H_
 
 #include <string>
 
 #include "ppapi/c/ppb_input_event.h"
@@ skipping 263 matching lines @@
   /// @param[in] time_stamp A <code>PP_TimeTicks</code> indicating the time
   /// when the event occured.
   ///
   /// @param[in]  modifiers A bit field combination of the
   /// <code>PP_InputEvent_Modifier</code> flags.
   ///
   /// @param[in] key_code This value reflects the DOM KeyboardEvent
   /// <code>keyCode</code> field. Chrome populates this with the Windows-style
   /// Virtual Key code of the key.
   ///
+  /// @param[in] usb_scan_code The USB scancode that corresponds to the key
+  /// that generated this keyboard event.
+  ///
   /// @param[in] character_text This value represents the typed character as a
   /// UTF-8 string.
   KeyboardInputEvent(Instance* instance,
                      PP_InputEvent_Type type,
                      PP_TimeTicks time_stamp,
                      uint32_t modifiers,
                      uint32_t key_code,
+                     uint32_t usb_scan_code,
                      const Var& character_text);
 
   /// Returns the DOM keyCode field for the keyboard event.
   /// Chrome populates this with the Windows-style Virtual Key code of the key.
   uint32_t GetKeyCode() const;
 
+  /// Returns the USB scancode that corresponds to the key that generated this
+  /// keyboard event.
+  uint32_t GetUsbScanCode_Dev() const;
+
   /// Returns the typed character for the given character event.
   ///
   /// @return A string var representing a single typed character for character
   /// input events. For non-character input events the return value will be an
   /// undefined var.
   Var GetCharacterText() const;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_INPUT_EVENT_H_