Add GetUsbKeyCode dev interface for Pepper key events

ppapi/thunk/ppb_input_event_api.h

Index: ppapi/thunk/ppb_input_event_api.h
diff --git a/ppapi/thunk/ppb_input_event_api.h b/ppapi/thunk/ppb_input_event_api.h
index f23c7959738fa1adeced5bfbac788d0a1c5ebac5..d87529039e291144718d4b87ca57d75e6858561b 100644
--- a/ppapi/thunk/ppb_input_event_api.h
+++ b/ppapi/thunk/ppb_input_event_api.h
@@ -6,6 +6,7 @@
 #define PPAPI_THUNK_PPB_INPUT_EVENT_API_H_
 
 #include "ppapi/c/dev/ppb_ime_input_event_dev.h"
+#include "ppapi/c/dev/ppb_keyboard_input_event_dev.h"
 #include "ppapi/c/ppb_input_event.h"
 #include "ppapi/thunk/ppapi_thunk_export.h"
 
@@ -35,6 +36,8 @@ class PPAPI_THUNK_EXPORT PPB_InputEvent_API {
   virtual PP_Bool GetWheelScrollByPage() = 0;
   virtual uint32_t GetKeyCode() = 0;
   virtual PP_Var GetCharacterText() = 0;
+  virtual PP_Bool SetUsbScanCode(uint32_t) = 0;
+  virtual uint32_t GetUsbScanCode() = 0;
   virtual uint32_t GetIMESegmentNumber() = 0;
   virtual uint32_t GetIMESegmentOffset(uint32_t index) = 0;
   virtual int32_t GetIMETargetSegment() = 0;