Improve Material ink effects

sky/engine/public/platform/WebInputEvent.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 250 matching lines @@
     float offsetX = 0;
     float offsetY = 0;
 
     WebWheelEvent() : WebInputEvent(sizeof(WebWheelEvent)) {}
 };
 
 // WebGestureEvent ------------------------------------------------------------
 
 class WebGestureEvent : public WebInputEvent {
 public:
+    int primaryPointer = 0;
     float x = 0;
     float y = 0;
 
     union {
         // Tap information must be set for GestureTap, GestureTapUnconfirmed,
         // and GestureDoubleTap events.
         struct {
             int tapCount;
             float width;
             float height;
@@ skipping 48 matching lines @@
     {
         memset(&data, 0, sizeof(data));
     }
 };
 
 #pragma pack(pop)
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PUBLIC_PLATFORM_WEBINPUTEVENT_H_