[Xamarin.Android.Bcl-Tests] Add LinkerDescription.xml (#934)

Some of the tests use reflection to access BCL API. Parts of the
needed API is linked away by the linker. The link description file
makes sure the needed parts stay in the mscorlib and thus the tests
don't fail.

This fixes remaining issues [^1] in `Xamarin.Android.Bcl-Tests` in
Release configuration and the test should run without failures
when linked (LinkSdkOnly).

[^1]: After merging https://github.com/xamarin/xamarin-android/pull/933

tests/Xamarin.Android.Bcl-Tests/Resources/LinkerDescription.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<linker>
+  <assembly fullname="mscorlib">
+    <type fullname="System.Security.Permissions.UIPermission">
+      <method name="System.Security.Permissions.IBuiltInPermission.GetTokenIndex"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyProductAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyCopyrightAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyTrademarkAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyVersionAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyFileVersionAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyInformationalVersionAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyCultureAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyAlgorithmIdAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyFlagsAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyDelaySignAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Reflection.AssemblyKeyNameAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Runtime.CompilerServices.MethodImplAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.Runtime.InteropServices.DllImportAttribute">
+      <method name=".ctor"/>
+    </type>
+    <type fullname="System.ConsoleKey"/>
+    <type fullname="System.ConsoleKeyInfo"/>
+  </assembly>
+</linker>

tests/Xamarin.Android.Bcl-Tests/Xamarin.Android.Bcl-Tests.csproj

@@ -89,6 +89,9 @@
     <AndroidResource Include="Resources\mipmap-xxhdpi\Icon.png" />
     <AndroidResource Include="Resources\mipmap-xxxhdpi\Icon.png" />
   </ItemGroup>
+  <ItemGroup>
+    <LinkDescription Include="Resources\LinkerDescription.xml" />
+  </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
   <Import Project="Xamarin.Android.Bcl-Tests.targets" />
   <PropertyGroup>