Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/Hosting/WorkflowInstanceProxy.cs

@@ -0,0 +1,52 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.Activities.Hosting
+{
+    using System;
+    using System.Runtime;
+
+    public sealed class WorkflowInstanceProxy
+    {
+        WorkflowInstance instance;
+
+        internal WorkflowInstanceProxy(WorkflowInstance instance)
+        {
+            this.instance = instance;
+        }
+
+        public Guid Id
+        {
+            get
+            {
+                return this.instance.Id;
+            }
+        }
+
+        public Activity WorkflowDefinition
+        {
+            get
+            {
+                return this.instance.WorkflowDefinition;
+            }
+        }
+
+        public IAsyncResult BeginResumeBookmark(Bookmark bookmark, object value, AsyncCallback callback, object state)
+        {
+            return BeginResumeBookmark(bookmark, value, TimeSpan.MaxValue, callback, state);
+        }
+
+        public IAsyncResult BeginResumeBookmark(Bookmark bookmark, object value, TimeSpan timeout, AsyncCallback callback, object state)
+        {
+            TimeoutHelper.ThrowIfNegativeArgument(timeout);
+
+            return this.instance.OnBeginResumeBookmark(bookmark, value, timeout, callback, state);
+        }
+
+        public BookmarkResumptionResult EndResumeBookmark(IAsyncResult result)
+        {
+            return this.instance.OnEndResumeBookmark(result);
+        }
+    }
+}