Modify precompilation to always generate instrumentation

src/Microsoft.AspNet.Mvc.Razor/Compilation/CompilerCacheEntry.cs

@@ -22,6 +22,8 @@ namespace Microsoft.AspNet.Mvc.Razor
             Length = info.Length;
             LastModified = info.LastModified;
             Hash = info.Hash;
+            // Precompiled views are always instrumented.
+            IsInstrumented = true;
         }
 
         /// <summary>

src/Microsoft.AspNet.Mvc.Razor/Razor/PreCompileViews/RazorPreCompiler.cs

@@ -32,6 +32,7 @@ namespace Microsoft.AspNet.Mvc.Razor
         {
             _serviceProvider = designTimeServiceProvider;
             _host = host;
+            _host.EnableInstrumentation = true;
 
             var appEnv = _serviceProvider.GetService<IApplicationEnvironment>();
             _fileSystem = optionsAccessor.Options.FileSystem;