NS2.1 Sync new changes, mobile profiles (#13198)

* Add RuntimeHelpers.GetSubArray. Add missing types to NS's TypeForwarders.cs

* more NS2.1 changes

* ios changes

* Update Decimal (it's now readonly struct)

* fix mcs

* add ROMC.cs

* Fix tests, finish monodroid profile

* Make SRE-not-supported NS2.1 compatible

* Make monotouch_tv and watch NS2.1 compatible

* make some SRE types more NS21 compatible (non-abstract now)

* bump corefx

* More NS21 fixes

* bump coreclr acceptance tests

* Bump API snapshot submodule

* [csproj] Update project files

8 files changed, 41 insertions, 0 deletions

diff --git a/mcs/class/System.Net.Http/HttpClientHandler.Legacy.cs b/mcs/class/System.Net.Http/HttpClientHandler.Legacy.cs
index 97904594ca3..d4e64ddda11 100644
--- a/mcs/class/System.Net.Http/HttpClientHandler.Legacy.cs
+++ b/mcs/class/System.Net.Http/HttpClientHandler.Legacy.cs
@@ -7,5 +7,8 @@ namespace System.Net.Http
 	partial class HttpClientHandler : HttpMessageHandler
 	{
 		static IMonoHttpClientHandler CreateDefaultHandler () => new MonoWebRequestHandler ();
+
+		// NS2.1:
+		public static System.Func<System.Net.Http.HttpRequestMessage, System.Security.Cryptography.X509Certificates.X509Certificate2, System.Security.Cryptography.X509Certificates.X509Chain, System.Net.Security.SslPolicyErrors, bool> DangerousAcceptAnyServerCertificateValidator => throw new PlatformNotSupportedException ();
 	}
 }
diff --git a/mcs/class/System.Net.Http/System.Net.Http.csproj b/mcs/class/System.Net.Http/System.Net.Http.csproj
index 9d626433300..c19ddfb4b38 100644
--- a/mcs/class/System.Net.Http/System.Net.Http.csproj
+++ b/mcs/class/System.Net.Http/System.Net.Http.csproj
@@ -178,6 +178,7 @@
         <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
         <Compile Include="System.Net.Http\StreamContent.cs" />
         <Compile Include="System.Net.Http\StringContent.cs" />
+        <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
       </ItemGroup>
     </When>
     <When Condition="'$(Platform)' == 'winaot'">
@@ -240,6 +241,7 @@
         <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
         <Compile Include="System.Net.Http\StreamContent.cs" />
         <Compile Include="System.Net.Http\StringContent.cs" />
+        <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
       </ItemGroup>
     </When>
     <When Condition="'$(Platform)' == 'wasm'">
@@ -303,6 +305,7 @@
         <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
         <Compile Include="System.Net.Http\StreamContent.cs" />
         <Compile Include="System.Net.Http\StringContent.cs" />
+        <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
       </ItemGroup>
     </When>
     <When Condition="'$(Platform)' == 'unreal'">
@@ -365,6 +368,7 @@
         <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
         <Compile Include="System.Net.Http\StreamContent.cs" />
         <Compile Include="System.Net.Http\StringContent.cs" />
+        <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
       </ItemGroup>
     </When>
     <When Condition="'$(Platform)' == 'orbis'">
@@ -427,6 +431,7 @@
         <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
         <Compile Include="System.Net.Http\StreamContent.cs" />
         <Compile Include="System.Net.Http\StringContent.cs" />
+        <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
       </ItemGroup>
     </When>
     <When Condition="'$(Platform)' == 'net_4_x'">
@@ -492,6 +497,7 @@
             <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
             <Compile Include="System.Net.Http\StreamContent.cs" />
             <Compile Include="System.Net.Http\StringContent.cs" />
+            <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
           </ItemGroup>
         </When>
         <When Condition="'$(HostPlatform)' == 'unix'">
@@ -900,6 +906,7 @@
         <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
         <Compile Include="System.Net.Http\StreamContent.cs" />
         <Compile Include="System.Net.Http\StringContent.cs" />
+        <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
       </ItemGroup>
     </When>
     <When Condition="'$(Platform)' == 'monotouch_tv'">
@@ -967,6 +974,7 @@
         <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
         <Compile Include="System.Net.Http\StreamContent.cs" />
         <Compile Include="System.Net.Http\StringContent.cs" />
+        <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
       </ItemGroup>
     </When>
     <When Condition="'$(Platform)' == 'monotouch'">
@@ -1034,6 +1042,7 @@
         <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
         <Compile Include="System.Net.Http\StreamContent.cs" />
         <Compile Include="System.Net.Http\StringContent.cs" />
+        <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
       </ItemGroup>
     </When>
     <When Condition="'$(Platform)' == 'monodroid'">
@@ -1097,6 +1106,7 @@
         <Compile Include="System.Net.Http\MultipartFormDataContent.cs" />
         <Compile Include="System.Net.Http\StreamContent.cs" />
         <Compile Include="System.Net.Http\StringContent.cs" />
+        <Compile Include="corefx\ReadOnlyMemoryContent.cs" />
       </ItemGroup>
     </When>
   </Choose>
diff --git a/mcs/class/System.Net.Http/System.Net.Http/HttpClient.android.cs b/mcs/class/System.Net.Http/System.Net.Http/HttpClient.android.cs
index f48b49cd104..be3b46db0c5 100644
--- a/mcs/class/System.Net.Http/System.Net.Http/HttpClient.android.cs
+++ b/mcs/class/System.Net.Http/System.Net.Http/HttpClient.android.cs
@@ -1,5 +1,7 @@
 using System;
 using System.Reflection;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace System.Net.Http {
 	public partial class HttpClient {
diff --git a/mcs/class/System.Net.Http/System.Net.Http/HttpClient.cs b/mcs/class/System.Net.Http/System.Net.Http/HttpClient.cs
index a4cb8ac68f2..4ac94fa839c 100644
--- a/mcs/class/System.Net.Http/System.Net.Http/HttpClient.cs
+++ b/mcs/class/System.Net.Http/System.Net.Http/HttpClient.cs
@@ -335,5 +335,11 @@ namespace System.Net.Http
 				return await resp.Content.ReadAsStringAsync ().ConfigureAwait (false);
 			}
 		}
+
+		// NS2.1 methods, added here while CoreFX HttpClient PR is not merged
+		public Task<HttpResponseMessage> PatchAsync(string requestUri, HttpContent content) => throw new PlatformNotSupportedException();
+		public Task<HttpResponseMessage> PatchAsync(string requestUri, HttpContent content, CancellationToken cancellationToken) => throw new PlatformNotSupportedException();
+		public Task<HttpResponseMessage> PatchAsync(Uri requestUri, HttpContent content) => throw new PlatformNotSupportedException();
+		public Task<HttpResponseMessage> PatchAsync(Uri requestUri, HttpContent content, CancellationToken cancellationToken) => throw new PlatformNotSupportedException();
 	}
 }
diff --git a/mcs/class/System.Net.Http/System.Net.Http/HttpClientHandler.platformnotsupported.cs b/mcs/class/System.Net.Http/System.Net.Http/HttpClientHandler.platformnotsupported.cs
index f796a202d54..05935885325 100644
--- a/mcs/class/System.Net.Http/System.Net.Http/HttpClientHandler.platformnotsupported.cs
+++ b/mcs/class/System.Net.Http/System.Net.Http/HttpClientHandler.platformnotsupported.cs
@@ -169,5 +169,8 @@ namespace System.Net.Http
 			get { throw new PlatformNotSupportedException (EXCEPTION_MESSAGE); }
 			set { throw new PlatformNotSupportedException (EXCEPTION_MESSAGE); }
 		}
+
+		// NS2.1:
+		public static System.Func<System.Net.Http.HttpRequestMessage, System.Security.Cryptography.X509Certificates.X509Certificate2, System.Security.Cryptography.X509Certificates.X509Chain, System.Net.Security.SslPolicyErrors, bool> DangerousAcceptAnyServerCertificateValidator => throw new PlatformNotSupportedException ();
 	}
 }
diff --git a/mcs/class/System.Net.Http/System.Net.Http/HttpMethod.cs b/mcs/class/System.Net.Http/System.Net.Http/HttpMethod.cs
index a88b78464b0..58754499129 100644
--- a/mcs/class/System.Net.Http/System.Net.Http/HttpMethod.cs
+++ b/mcs/class/System.Net.Http/System.Net.Http/HttpMethod.cs
@@ -131,5 +131,8 @@ namespace System.Net.Http
 		{
 			return method;
 		}
+
+		// NS2.1:
+		public static System.Net.Http.HttpMethod Patch => throw new PlatformNotSupportedException ();
 	}
 }
diff --git a/mcs/class/System.Net.Http/corefx/ReadOnlyMemoryContent.cs b/mcs/class/System.Net.Http/corefx/ReadOnlyMemoryContent.cs
new file mode 100644
index 00000000000..f4272bfb550
--- /dev/null
+++ b/mcs/class/System.Net.Http/corefx/ReadOnlyMemoryContent.cs
@@ -0,0 +1,13 @@
+// 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.
+
+namespace System.Net.Http
+{
+    public sealed partial class ReadOnlyMemoryContent : System.Net.Http.HttpContent
+    {
+        public ReadOnlyMemoryContent(System.ReadOnlyMemory<byte> content) => throw new PlatformNotSupportedException();
+        protected internal override System.Threading.Tasks.Task SerializeToStreamAsync(System.IO.Stream stream, System.Net.TransportContext context) => throw new PlatformNotSupportedException();
+        protected internal override bool TryComputeLength(out long length) => throw new PlatformNotSupportedException();
+    }
+}
\ No newline at end of file
diff --git a/mcs/class/System.Net.Http/legacy.sources b/mcs/class/System.Net.Http/legacy.sources
index 4a200fd6e6b..1a5047bda62 100644
--- a/mcs/class/System.Net.Http/legacy.sources
+++ b/mcs/class/System.Net.Http/legacy.sources
@@ -22,6 +22,7 @@ System.Net.Http/MultipartContent.cs
 System.Net.Http/MultipartFormDataContent.cs
 System.Net.Http/StreamContent.cs
 System.Net.Http/StringContent.cs
+corefx/ReadOnlyMemoryContent.cs
 System.Net.Http.Headers/AuthenticationHeaderValue.cs
 System.Net.Http.Headers/CacheControlHeaderValue.cs
 System.Net.Http.Headers/CollectionExtensions.cs