Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/compmod/system/componentmodel/CompModSwitches.cs

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+//------------------------------------------------------------------------------
+// <copyright file="CompModSwitches.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.ComponentModel {
+    using System.Configuration.Assemblies;
+    using System.Diagnostics;
+    using System.Runtime.InteropServices;
+    using System.Runtime.Remoting;
+    using System.Runtime.Serialization.Formatters;
+    using System.Security.Permissions;
+    using System.Threading;
+
+    /// <internalonly/>    
+    [HostProtection(SharedState = true)]
+    internal static class CompModSwitches
+    {
+        
+        private static volatile BooleanSwitch commonDesignerServices;
+        private static volatile TraceSwitch eventLog;
+                
+        public static BooleanSwitch CommonDesignerServices {
+            get {
+                if (commonDesignerServices == null) {
+                    commonDesignerServices = new BooleanSwitch("CommonDesignerServices", "Assert if any common designer service is not found.");
+                }
+                return commonDesignerServices;
+            }
+        }   
+        
+        public static TraceSwitch EventLog {
+            get {
+                if (eventLog == null) {
+                    eventLog = new TraceSwitch("EventLog", "Enable tracing for the EventLog component.");
+                }
+                return eventLog;
+            }
+        }
+                                                                                                                                                                               
+    }
+}
+