Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/WorkflowApplicationIdleEventArgs.cs

@@ -0,0 +1,34 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.Activities
+{
+    using System.Activities.Hosting;
+    using System.Collections.ObjectModel;
+    using System.Runtime;
+
+    [Fx.Tag.XamlVisible(false)]
+    public class WorkflowApplicationIdleEventArgs : WorkflowApplicationEventArgs
+    {
+        ReadOnlyCollection<BookmarkInfo> bookmarks;
+
+        internal WorkflowApplicationIdleEventArgs(WorkflowApplication application)
+            : base(application)
+        {
+        }
+
+        public ReadOnlyCollection<BookmarkInfo> Bookmarks
+        {
+            get
+            {
+                if (this.bookmarks == null)
+                {
+                    this.bookmarks = this.Owner.GetBookmarksForIdle();
+                }
+
+                return this.bookmarks;
+            }
+        }
+    }
+}