Add unique_event_id to the WebTouchEvent

Source/web/WebInputEvent.cpp

Index: Source/web/WebInputEvent.cpp
diff --git a/Source/web/WebInputEvent.cpp b/Source/web/WebInputEvent.cpp
index e6ae5a93e4b065e2ab1a966c322f32951f59c7e3..d08f7cf0ba9b6382319405f69bd5daa0bc1a7ade 100644
--- a/Source/web/WebInputEvent.cpp
+++ b/Source/web/WebInputEvent.cpp
@@ -60,7 +60,7 @@ struct SameSizeAsWebGestureEvent : public SameSizeAsWebInputEvent {
 
 struct SameSizeAsWebTouchEvent : public SameSizeAsWebInputEvent {
     WebTouchPoint touchPoints[WebTouchEvent::touchesLengthCap];
-    int touchData[2];
+    int touchData[4];
 };
 
 static_assert(sizeof(WebInputEvent) == sizeof(SameSizeAsWebInputEvent), "WebInputEvent should not have gaps");