Hoisting FrameworkAssemblies for desktop frameworks during migration.

TestAssets/DesktopTestProjects/TestAppWithFrameworkAssemblies/ProjectB/Helper.cs

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+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+
+namespace TestLibrary
+{
+    public static class ProjectB
+    {
+        public static string GetMessage()
+        {
+            return "This string came from ProjectB";
+        }
+    }
+}

TestAssets/DesktopTestProjects/TestAppWithFrameworkAssemblies/ProjectB/project.json

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+{
+  "version": "1.0.0-*",
+  "buildOptions": {
+    "nowarn": [
+      "CS1591"
+    ],
+    "xmlDoc": true,
+    "additionalArguments": [
+      "-highentropyva+"
+    ]
+  },
+  "dependencies": {
+    "NETStandard.Library": "1.6.0"
+  },
+  "frameworks": {
+    "netstandard1.5": {},
+    "net451": {
+      "frameworkAssemblies": {
+        "System.ComponentModel.DataAnnotations": ""
+      }
+    }
+  }
+}