Add GetUsbKeyCode dev interface for Pepper key events

ppapi/shared_impl/ppb_input_event_shared.cc

Index: ppapi/shared_impl/ppb_input_event_shared.cc
diff --git a/ppapi/shared_impl/ppb_input_event_shared.cc b/ppapi/shared_impl/ppb_input_event_shared.cc
index 4f1a4d00c4c62bfa63e63f9f369495ea8d389731..3465d92fc95b03e284d27878fc59ceda29e04d20 100644
--- a/ppapi/shared_impl/ppb_input_event_shared.cc
+++ b/ppapi/shared_impl/ppb_input_event_shared.cc
@@ -95,6 +95,15 @@ PP_Var PPB_InputEvent_Shared::GetCharacterText() {
   return StringVar::StringToPPVar(data_.character_text);
 }
 
+PP_Bool PPB_InputEvent_Shared::SetUsbScanCode(uint32_t usb_scan_code) {
+  data_.usb_scan_code = usb_scan_code;
+  return PP_TRUE;
+}
+
+uint32_t PPB_InputEvent_Shared::GetUsbScanCode() {
+  return data_.usb_scan_code;
+}
+
 uint32_t PPB_InputEvent_Shared::GetIMESegmentNumber() {
   if (data_.composition_segment_offsets.empty())
     return 0;