Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/Debugger/OneBasedCounter.cs

@@ -0,0 +1,23 @@
+// <copyright>
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+
+namespace System.Activities.Debugger
+{
+    // Immutable, value >= 1
+    internal class OneBasedCounter
+    {
+        private int value;
+
+        internal OneBasedCounter(int value)
+        {
+            UnitTestUtility.Assert(value > 0, "value cannot less than one for OneBasedCounter");
+            this.value = value;
+        }
+
+        internal int Value
+        {
+            get { return this.value; }
+        }
+    }
+}