Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/XamlBuildTask/Microsoft/VisualStudio/Activities/VSDesignerPerfEventProvider.cs

@@ -0,0 +1,56 @@
+//----------------------------------------------------------------
+// <copyright company="Microsoft Corporation">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//----------------------------------------------------------------
+
+namespace Microsoft.VisualStudio.Activities
+{
+    using System;
+    using System.Diagnostics.Eventing;
+
+    internal class VSDesignerPerfEventProvider
+    {
+        private EventProvider provider = null;
+
+        public VSDesignerPerfEventProvider()
+        {
+            try
+            {
+                this.provider = new EventProvider(new Guid("{92C79DA3-CA7D-43d6-BF20-BBD15E7A4E49}"));
+            }
+            catch (PlatformNotSupportedException)
+            {
+                this.provider = null;
+            }
+        }
+
+        internal void WriteEvent(VSDesignerPerfEvents perfEvent)
+        {
+            if (this.IsEnabled())
+            {
+                this.WriteEventHelper((int)perfEvent);
+            }
+        }
+
+        private bool IsEnabled()
+        {
+            bool isEnabled = false;
+            if (this.provider != null)
+            {
+                isEnabled = this.provider.IsEnabled();
+            }
+
+            return isEnabled;
+        }
+
+        private void WriteEventHelper(int eventId)
+        {
+            if (this.provider != null)
+            {
+                EventDescriptor descriptor = new EventDescriptor(eventId, 0, 0, 0, 0, 0, 0);
+                this.provider.WriteEvent(ref descriptor);
+            }
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/VisualStudio/Activities/VSDesignerPerfEvents.cs

@@ -0,0 +1,14 @@
+//----------------------------------------------------------------
+// <copyright company="Microsoft Corporation">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//----------------------------------------------------------------
+
+namespace Microsoft.VisualStudio.Activities
+{
+    internal enum VSDesignerPerfEvents
+    {
+        XamlBuildTaskExecuteStart = 29,
+        XamlBuildTaskExecuteEnd = 30,
+    }
+}