Add GetUsbKeyCode dev interface for Pepper key events

ppapi/shared_impl/ppb_input_event_shared.h

Index: ppapi/shared_impl/ppb_input_event_shared.h
diff --git a/ppapi/shared_impl/ppb_input_event_shared.h b/ppapi/shared_impl/ppb_input_event_shared.h
index 1a297506ce21ea2a117dae81d22f4a5d0a36ddbb..a5ea55646b50337b9deacbf56b5462b35297aa80 100644
--- a/ppapi/shared_impl/ppb_input_event_shared.h
+++ b/ppapi/shared_impl/ppb_input_event_shared.h
@@ -40,6 +40,7 @@ struct PPAPI_SHARED_EXPORT InputEventData {
   bool wheel_scroll_by_page;
 
   uint32_t key_code;
+  uint32_t usb_scan_code;
 
   std::string character_text;
 
@@ -84,6 +85,8 @@ class PPAPI_SHARED_EXPORT PPB_InputEvent_Shared
   virtual PP_Bool GetWheelScrollByPage() OVERRIDE;
   virtual uint32_t GetKeyCode() OVERRIDE;
   virtual PP_Var GetCharacterText() OVERRIDE;
+  virtual PP_Bool SetUsbScanCode(uint32_t usb_scan_code) OVERRIDE;
+  virtual uint32_t GetUsbScanCode() OVERRIDE;
   virtual uint32_t GetIMESegmentNumber() OVERRIDE;
   virtual uint32_t GetIMESegmentOffset(uint32_t index) OVERRIDE;
   virtual int32_t GetIMETargetSegment() OVERRIDE;