Add a SetProperty API for CPS to passing msbuild properties

src/VisualStudio/Core/Def/Implementation/ProjectSystem/CPS/IWorkspaceProjectContext.cs

@@ -2,8 +2,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Threading;
-using System.Threading.Tasks;
 using Microsoft.CodeAnalysis;
 
 namespace Microsoft.VisualStudio.LanguageServices.ProjectSystem
@@ -25,6 +23,9 @@ internal interface IWorkspaceProjectContext : IDisposable
         // Options.
         void SetOptions(string commandLineForOptions);
 
+        // Other project properties.
+        void SetProperty(string name, object value);
+
         // References.
         void AddMetadataReference(string referencePath, MetadataReferenceProperties properties);
         void RemoveMetadataReference(string referencePath);

src/VisualStudio/Core/Impl/ProjectSystem/CPS/CPSProject_IWorkspaceProjectContext.cs

@@ -123,6 +123,11 @@ public void SetOptions(string commandLineForOptions)
             }
         }
 
+        public void SetProperty(string name, object value)
+        {
+            // TODO
+        }
+
         public void AddMetadataReference(string referencePath, MetadataReferenceProperties properties)
         {
             referencePath = FileUtilities.NormalizeAbsolutePath(referencePath);