Fix EventPipeProvider to enable listening to events without keyword (#1091)

Author: sywhang

src/Microsoft.Diagnostics.NETCore.Client/DiagnosticsClient/EventPipeProvider.cs

@@ -12,7 +12,7 @@ namespace Microsoft.Diagnostics.NETCore.Client
 {
     public sealed class EventPipeProvider
     {
-        public EventPipeProvider(string name, EventLevel eventLevel, long keywords = 0, IDictionary<string, string> arguments = null)
+        public EventPipeProvider(string name, EventLevel eventLevel, long keywords = 0xF00000000000, IDictionary<string, string> arguments = null)
         {
             Name = name;
             EventLevel = eventLevel;

src/tests/eventpipe/CustomEvents.cs

@@ -0,0 +1,67 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using Xunit;
+using System.IO;
+using System.Runtime.Loader;
+using System.Reflection;
+using Xunit.Abstractions;
+using System.Collections.Generic;
+using System.Diagnostics.Tracing;
+using EventPipe.UnitTests.Common;
+using Microsoft.Diagnostics.NETCore.Client;
+using Microsoft.Diagnostics.Tracing;
+
+namespace EventPipe.UnitTests.CustomEventsValidation
+{
+    public class MyEventSource : EventSource
+    {
+        public static MyEventSource Log = new MyEventSource();
+
+        public void Event1() { WriteEvent(1); }
+        public void Event2(string fileName) { WriteEvent(2, fileName); }
+        public void Event3() { WriteEvent(3); }
+    }
+
+    public class CustomEventTests
+    {
+        private readonly ITestOutputHelper output;
+
+        public CustomEventTests(ITestOutputHelper outputHelper)
+        {
+            output = outputHelper;
+        }
+
+        [Fact]
+        public async void CustomEventProducesEventsWithNoKeywords()
+        {
+            await RemoteTestExecutorHelper.RunTestCaseAsync(() => 
+            {
+                Dictionary<string, ExpectedEventCount> _expectedEventCounts = new Dictionary<string, ExpectedEventCount>()
+                {
+                    { "MyEventSource", -1 },
+                };
+
+                Action _eventGeneratingAction = () => 
+                {
+                    for (int i = 0; i < 1000; i++)
+                    {
+                        MyEventSource.Log.Event1();
+                        MyEventSource.Log.Event2("anotherFile");
+                        MyEventSource.Log.Event3();
+                    }
+                };
+ 
+                var providers = new List<EventPipeProvider>()
+                {
+                    new EventPipeProvider("MyEventSource", EventLevel.Informational)
+                };
+
+                var ret = IpcTraceTest.RunAndValidateEventCounts(_expectedEventCounts, _eventGeneratingAction, providers, 1024, null);
+                Assert.Equal(100, ret);
+            }, output);
+        }
+    }
+}