Runtime support for upcoming .NET Core WinRT Host (#23402)

* First pass at adding winrt host entry-point.

* There's no way to specify HResult-swapping on a function called via hosted-interop so just return the HResult instead.

* Use the WindowsRuntimeMarshal class to create the activation factory and initialize it.

* Implement loading the dependent assemblies of a WinRT assembly into an isolated load context.

* PR Feedback.

* Fail to get the activation factory if the found type is not a managed type exported from a winmd.

* Rearrange parameters based on PR feedback.

* Remove unneeded include.

* Make ActivationFactoryLoader internal.

* Fix null-ref in WinRT-dependent-assembly loading

* Remove extraneous "System."

1 files changed, 20 insertions, 0 deletions

diff --git a/src/vm/assemblynative.cpp b/src/vm/assemblynative.cpp
index eed310aaa6..9c1e467f2f 100644
--- a/src/vm/assemblynative.cpp
+++ b/src/vm/assemblynative.cpp
@@ -426,6 +426,26 @@ void QCALLTYPE AssemblyNative::GetLocation(QCall::AssemblyHandle pAssembly, QCal
     END_QCALL;
 }
 
+
+#ifdef FEATURE_COMINTEROP_WINRT_MANAGED_ACTIVATION
+void QCALLTYPE AssemblyNative::LoadTypeForWinRTTypeNameInContext(INT_PTR ptrAssemblyLoadContext, LPCWSTR pwzTypeName, QCall::ObjectHandleOnStack retType)
+{
+    QCALL_CONTRACT;
+
+    BEGIN_QCALL;
+
+    TypeHandle loadedType = WinRTTypeNameConverter::LoadManagedTypeForWinRTTypeName(pwzTypeName, (ICLRPrivBinder*)ptrAssemblyLoadContext, /* pbIsPrimitive */ nullptr);
+
+    if (!loadedType.IsNull())
+    {
+         GCX_COOP();
+         retType.Set(loadedType.GetManagedClassObject());
+    }
+
+    END_QCALL;
+}
+#endif
+
 void QCALLTYPE AssemblyNative::GetType(QCall::AssemblyHandle pAssembly, LPCWSTR wszName, BOOL bThrowOnError, BOOL bIgnoreCase, QCall::ObjectHandleOnStack retType, QCall::ObjectHandleOnStack keepAlive)
 {
     CONTRACTL