Add GetUsbKeyCode dev interface for Pepper key events

ppapi/cpp/input_event.cc

Index: ppapi/cpp/input_event.cc
diff --git a/ppapi/cpp/input_event.cc b/ppapi/cpp/input_event.cc
index 632b1eccd93652f9f15e227e28bb9fdbf342756c..480fa6776969d14a710ca27e848d3a195e28ba6d 100644
--- a/ppapi/cpp/input_event.cc
+++ b/ppapi/cpp/input_event.cc
@@ -22,6 +22,10 @@ template <> const char* interface_name<PPB_KeyboardInputEvent>() {
   return PPB_KEYBOARD_INPUT_EVENT_INTERFACE;
 }
 
+template <> const char* interface_name<PPB_KeyboardInputEvent_Dev>() {
+  return PPB_KEYBOARD_INPUT_EVENT_DEV_INTERFACE;
+}
+
 template <> const char* interface_name<PPB_MouseInputEvent>() {
   return PPB_MOUSE_INPUT_EVENT_INTERFACE;
 }
@@ -218,4 +222,20 @@ Var KeyboardInputEvent::GetCharacterText() const {
                  pp_resource()));
 }
 
+// PPB_KeyboardInputEvent_Dev interface.
+
+bool KeyboardInputEvent::SetUsbScanCode(uint32_t usb_scan_code) {
+  if (!has_interface<PPB_KeyboardInputEvent_Dev>())
+    return false;
+  return PP_ToBool(get_interface<PPB_KeyboardInputEvent_Dev>()->SetUsbScanCode(
+      pp_resource(), usb_scan_code));
+}
+
+uint32_t KeyboardInputEvent::GetUsbScanCode() const {
+  if (!has_interface<PPB_KeyboardInputEvent_Dev>())
+    return 0;
+  return get_interface<PPB_KeyboardInputEvent_Dev>()->GetUsbScanCode(
+      pp_resource());
+}
+
 }  // namespace pp