[wasm-browser] Test failures in System.Xml.RW.XmlReader.Tests with PlatformNotSupportedException

[directhex]

We should be skipping these tests on wasm:

[14:12:17] dbug: test-browser[0]
      [FAIL] System.Xml.Tests.AsyncReaderLateInitTests.InitializationWithUriOnNonAsyncReaderTrows
      
[14:12:17] dbug: test-browser[0]
      Assert.Throws() Failure
      
[14:12:17] dbug: test-browser[0]
      Expected: typeof(System.Net.Http.HttpRequestException)
      
[14:12:17] dbug: test-browser[0]
      Actual:   typeof(System.PlatformNotSupportedException): Cannot wait on monitors on this runtime.
      
[14:12:17] dbug: test-browser[0]
      ---- System.PlatformNotSupportedException : Cannot wait on monitors on this runtime.
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Monitor.ObjWait(Boolean exitContext, Int32 millisecondsTimeout, Object obj)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Monitor.Wait(Object obj, Int32 millisecondsTimeout, Boolean exitContext)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Monitor.Wait(Object obj, Int32 millisecondsTimeout)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.ManualResetEventSlim.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Tasks.Task.SpinThenBlockingWait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Tasks.Task.InternalWaitCore(Int32 millisecondsTimeout, CancellationToken cancellationToken)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Tasks.Task.InternalWait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlTextReaderImpl.FinishInitUriString()
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlTextReaderImpl..ctor(String uriStr, XmlReaderSettings settings, XmlParserContext context, XmlResolver uriResolver)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlReaderSettings.CreateReader(String inputUri, XmlParserContext inputContext)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings, XmlParserContext inputContext)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.Tests.AsyncReaderLateInitTests.<>c.<InitializationWithUriOnNonAsyncReaderTrows>b__9_0()
      
[14:12:17] dbug: test-browser[0]
      ----- Inner Stack Trace -----
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Monitor.ObjWait(Boolean exitContext, Int32 millisecondsTimeout, Object obj)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Monitor.Wait(Object obj, Int32 millisecondsTimeout, Boolean exitContext)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Monitor.Wait(Object obj, Int32 millisecondsTimeout)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.ManualResetEventSlim.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Tasks.Task.SpinThenBlockingWait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Tasks.Task.InternalWaitCore(Int32 millisecondsTimeout, CancellationToken cancellationToken)
      
[14:12:17] dbug: test-browser[0]
         at System.Threading.Tasks.Task.InternalWait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlTextReaderImpl.FinishInitUriString()
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlTextReaderImpl..ctor(String uriStr, XmlReaderSettings settings, XmlParserContext context, XmlResolver uriResolver)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlReaderSettings.CreateReader(String inputUri, XmlParserContext inputContext)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings, XmlParserContext inputContext)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings)
      
[14:12:17] dbug: test-browser[0]
         at System.Xml.Tests.AsyncReaderLateInitTests.<>c.<InitializationWithUriOnNonAsyncReaderTrows>b__9_0()

https://helix.dot.net/api/2019-06-17/jobs/ca5a7a0a-81f9-4293-8570-e1481e234e7e/workitems/System.Xml.RW.XmlReader.Tests/console

[ghost]

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[akoeplinger]

We probably didn't see this with the v8 runs since I assume we ran into the file:// case here:

runtime/src/libraries/System.Private.Xml/src/System/Xml/XmlDownloadManager.cs

Lines 15 to 24 in 09b9a5b

	if (uri.Scheme == "file")
	{
	return new FileStream(uri.LocalPath, FileMode.Open, FileAccess.Read, FileShare.Read, 1);
	}
	else
	{
	// This code should be changed if HttpClient ever gets real synchronous methods. For now,
	// we just use the asynchronous methods and block waiting for them to complete.
	return GetNonFileStreamAsync(uri, credentials, proxy).GetAwaiter().GetResult();
	}