[WIP] firebase init Error

sdk-intergration/LocalPackages/com.neuecc.unirx/Scripts/System/IOptimizedObservable.cs

@@ -0,0 +1,27 @@
+using System;
+
+namespace UniRx
+{
+    public interface IOptimizedObservable<T> : IObservable<T>
+    {
+        bool IsRequiredSubscribeOnCurrentThread();
+    }
+
+    public static class OptimizedObservableExtensions
+    {
+        public static bool IsRequiredSubscribeOnCurrentThread<T>(this IObservable<T> source)
+        {
+            var obs = source as IOptimizedObservable<T>;
+            if (obs == null) return true;
+
+            return obs.IsRequiredSubscribeOnCurrentThread();
+        }
+
+        public static bool IsRequiredSubscribeOnCurrentThread<T>(this IObservable<T> source, IScheduler scheduler)
+        {
+            if (scheduler == Scheduler.CurrentThread) return true;
+
+            return IsRequiredSubscribeOnCurrentThread(source);
+        }
+    }
+}