[WIP] firebase init Error

sdk-intergration/LocalPackages/com.neuecc.unirx/Scripts/UnityEngineBridge/CancellationToken.cs

@@ -0,0 +1,40 @@
+#if !(NETFX_CORE || NET_4_6 || NET_STANDARD_2_0 || UNITY_WSA_10_0)
+
+using System;
+
+namespace UniRx
+{
+    public struct CancellationToken
+    {
+        readonly ICancelable source;
+
+        public static readonly CancellationToken Empty = new CancellationToken(null);
+        
+        /// <summary>Same as Empty.</summary>
+        public static readonly CancellationToken None = new CancellationToken(null);
+
+        public CancellationToken(ICancelable source)
+        {
+            this.source = source;
+        }
+
+        public bool IsCancellationRequested
+        {
+            get
+            {
+                return (source == null) ? false : source.IsDisposed;
+            }
+        }
+
+        public void ThrowIfCancellationRequested()
+        {
+            if (IsCancellationRequested)
+            {
+                throw new OperationCanceledException();
+            }
+        }
+    }
+}
+
+#endif
+