add some fix

com.unity.uiwidgets/Runtime/gestures/force_press.cs

         }
 
         public GestureForcePressStartCallback onStart;
-        GestureForcePressUpdateCallback onUpdate;
-        GestureForcePressPeakCallback onPeak;
+        public GestureForcePressUpdateCallback onUpdate;
+        public GestureForcePressPeakCallback onPeak;
         public GestureForcePressEndCallback onEnd;
         public readonly float startPressure;
         public readonly float peakPressure;

com.unity.uiwidgets/Runtime/painting/image_cache.cs

             );
         }
 
-        bool containsKey(Object key) {
+        public bool containsKey(Object key) {
             return _pendingImages[key] != null || _cache[key] != null;
         }
 

com.unity.uiwidgets/Runtime/painting/image_provider.cs

             return new ImageStream();
         }
 
-        void resolveStreamForKey(ImageConfiguration configuration, ImageStream stream, T key,
+        public virtual void resolveStreamForKey(ImageConfiguration configuration, ImageStream stream, T key,
             ImageErrorListener handleError) {
             if (stream.completer != null) {
                 ImageStreamCompleter completerEdge = PaintingBinding.instance.imageCache.putIfAbsent(