Add GetUsbKeyCode dev interface for Pepper key events

ppapi/thunk/ppb_input_event_thunk.cc

Index: ppapi/thunk/ppb_input_event_thunk.cc
diff --git a/ppapi/thunk/ppb_input_event_thunk.cc b/ppapi/thunk/ppb_input_event_thunk.cc
index 388b011a68484fd54e11aed07e4ffc7447e09264..934c02efb7bb03b2dbbe5f6b7d1c31d2b252362b 100644
--- a/ppapi/thunk/ppb_input_event_thunk.cc
+++ b/ppapi/thunk/ppb_input_event_thunk.cc
@@ -231,12 +231,14 @@ PP_Resource CreateKeyboardInputEvent(PP_Instance instance,
                                      PP_TimeTicks time_stamp,
                                      uint32_t modifiers,
                                      uint32_t key_code,
+                                     uint32_t usb_scan_code,
                                      struct PP_Var character_text) {
   EnterFunction<ResourceCreationAPI> enter(instance, true);
   if (enter.failed())
     return 0;
   return enter.functions()->CreateKeyboardInputEvent(instance, type, time_stamp,
                                                      modifiers, key_code,
+                                                     usb_scan_code,
                                                      character_text);
 }
 
@@ -257,6 +259,13 @@ uint32_t GetKeyCode(PP_Resource key_event) {
   return enter.object()->GetKeyCode();
 }
 
+uint32_t GetUsbScanCode_Dev(PP_Resource key_event) {
+  EnterInputEvent enter(key_event, true);
+  if (enter.failed())
+    return 0;
+  return enter.object()->GetUsbScanCode_Dev();
+}
+
 PP_Var GetCharacterText(PP_Resource character_event) {
   EnterInputEvent enter(character_event, true);
   if (enter.failed())
@@ -268,6 +277,7 @@ const PPB_KeyboardInputEvent g_ppb_keyboard_input_event_thunk = {
   &CreateKeyboardInputEvent,
   &IsKeyboardInputEvent,
   &GetKeyCode,
+  &GetUsbScanCode_Dev,
   &GetCharacterText
 };