Update to newer Blazor.Mono. Fixes #6726 (#8782)

build/runtimes.props

@@ -1,7 +1,7 @@
 <Project>
 
   <ItemGroup>
-    <!-- Workaround https://github.com/aspnet/AspNetCore/issues/6726. Required because illink (part of Microsoft.AspNetCore.Blazor.Mono) depends on .NET Core 2.x -->
+    <!-- BaselineGenerator is netcoreapp2.1. Other build tools may also require 2.x. -->
     <DotNetCoreRuntime Include="2.2.1" />
 
     <DotNetCoreRuntime Include="$(MicrosoftNETCoreAppPackageVersion)"

eng/Versions.props

@@ -164,7 +164,7 @@
     <SystemIdentityModelTokensJwtPackageVersion>5.3.0</SystemIdentityModelTokensJwtPackageVersion>
     <WindowsAzureStoragePackageVersion>8.1.4</WindowsAzureStoragePackageVersion>
     <!-- Dependencies for Blazor. -->
-    <MicrosoftAspNetCoreBlazorMonoPackageVersion>0.8.0-preview-20190204.1</MicrosoftAspNetCoreBlazorMonoPackageVersion>
+    <MicrosoftAspNetCoreBlazorMonoPackageVersion>0.10.0-preview-20190325.1</MicrosoftAspNetCoreBlazorMonoPackageVersion>
     <!-- Packages from 2.1/2.2 branches used for site extension build -->
     <MicrosoftAspNetCoreAzureAppServicesSiteExtension21PackageVersion>2.1.1</MicrosoftAspNetCoreAzureAppServicesSiteExtension21PackageVersion>
     <MicrosoftAspNetCoreAzureAppServicesSiteExtension22PackageVersion>2.2.0</MicrosoftAspNetCoreAzureAppServicesSiteExtension22PackageVersion>

src/Components/Blazor/Build/test/RuntimeDependenciesResolverTest.cs

@@ -90,7 +90,7 @@ namespace Microsoft.AspNetCore.Blazor.Build.Test
                 "System.Data.dll",
                 "System.Diagnostics.Debug.dll",
                 "System.Diagnostics.Tracing.dll",
-                "System.Drawing.dll",
+                "System.Drawing.Common.dll",
                 "System.IO.Compression.dll",
                 "System.IO.Compression.FileSystem.dll",
                 "System.Linq.dll",

src/Components/Blazor/testassets/MonoSanityClient/Examples.cs

@@ -11,6 +11,14 @@ namespace MonoSanityClient
 {
     public static class Examples
     {
+        static Examples()
+        {
+            // We have to populate GetHttpMessageHandler with something (like the real
+            // Blazor web assembly host does), otherwise HttpClientHandler's constructor
+            // gets into an infinite loop.
+            FakeHttpMessageHandler.Attach();
+        }
+
         public static string AddNumbers(int a, int b)
             => (a + b).ToString();
 

src/Components/Blazor/testassets/MonoSanityClient/FakeHttpMessageHandler.cs

@@ -0,0 +1,26 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Net.Http;
+using System.Reflection;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MonoSanityClient
+{
+    class FakeHttpMessageHandler : HttpMessageHandler
+    {
+        public static void Attach()
+        {
+            var getHttpMessageHandlerField = typeof(HttpClient).GetField(
+                "GetHttpMessageHandler",
+                BindingFlags.Static | BindingFlags.NonPublic);
+            Func<HttpMessageHandler> handlerFactory = () => new FakeHttpMessageHandler();
+            getHttpMessageHandlerField.SetValue(null, handlerFactory);
+        }
+
+        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+            => throw new NotImplementedException($"{nameof(FakeHttpMessageHandler)} cannot {nameof(SendAsync)}.");
+    }
+}