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..f32ec4ca0b909946a4565278480685c8383927d3 100644
--- a/ppapi/thunk/ppb_input_event_thunk.cc
+++ b/ppapi/thunk/ppb_input_event_thunk.cc
@@ -271,6 +271,27 @@ const PPB_KeyboardInputEvent g_ppb_keyboard_input_event_thunk = {
   &GetCharacterText
 };
 
+// _Dev interface.
+
+PP_Bool SetUsbScanCode(PP_Resource key_event, uint32_t usb_scan_code) {
+  EnterInputEvent enter(key_event, true);
+  if (enter.failed())
+    return PP_FALSE;
+  return enter.object()->SetUsbScanCode(usb_scan_code);
+}
+
+uint32_t GetUsbScanCode(PP_Resource key_event) {
+  EnterInputEvent enter(key_event, true);
+  if (enter.failed())
+    return 0;
+  return enter.object()->GetUsbScanCode();
+}
+
+const PPB_KeyboardInputEvent_Dev g_ppb_keyboard_input_event_dev_thunk = {
+  &SetUsbScanCode,
+  &GetUsbScanCode,
+};
+
 // Composition -----------------------------------------------------------------
 
 PP_Bool IsIMEInputEvent(PP_Resource resource) {
@@ -347,6 +368,11 @@ const PPB_KeyboardInputEvent_1_0* GetPPB_KeyboardInputEvent_1_0_Thunk() {
   return &g_ppb_keyboard_input_event_thunk;
 }
 
+const PPB_KeyboardInputEvent_Dev_0_1*
+    GetPPB_KeyboardInputEvent_Dev_0_1_Thunk() {
+  return &g_ppb_keyboard_input_event_dev_thunk;
+}
+
 const PPB_WheelInputEvent_1_0* GetPPB_WheelInputEvent_1_0_Thunk() {
   return &g_ppb_wheel_input_event_thunk;
 }