Generate vmservice_io.dill along with platform.dill.

tools/patch_sdk.dart

 #!/usr/bin/env dart
 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Command line tool to merge the SDK libraries and our patch files.
 /// This is currently designed as an offline tool, but we could automate it.
 
 import 'dart:io';
 import 'dart:isolate' show RawReceivePort;
 import 'dart:async';
 import 'dart:math' as math;
 import 'dart:convert' show JSON;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:path/path.dart' as path;
 
 import 'package:front_end/src/fasta/fasta.dart' as fasta
-    show compilePlatform, writeDepsFile;
+    show compile, compilePlatform, writeDepsFile;
 
 import 'package:compiler/src/kernel/fasta_support.dart' as dart2js
     show compilePlatform;
 
 /// Set of input files that were read by this script to generate patched SDK.
 /// We will dump it out into the depfile for ninja to use.
 ///
 /// For more information see GN and Ninja references:
 ///    https://chromium.googlesource.com/chromium/src/+/56807c6cb383140af0c03da8f6731d77785d7160/tools/gn/docs/reference.md#depfile_string_File-name-for-input-dependencies-for-actions
 ///    https://ninja-build.org/manual.html#_depfile
@@ skipping 71 matching lines @@
   for (SdkLibrary library in sdkLibraries) {
     if (forDart2js && library.isVmLibrary) continue;
     if (forVm && library.isDart2JsLibrary) continue;
     _applyPatch(library, sdkLibIn, patchIn, sdkOut, locations);
   }
 
   if (forVm) _copyExtraVmLibraries(sdkOut, locations);
 
   Uri platform = outDirUri.resolve('platform.dill.tmp');
   Uri outline = outDirUri.resolve('outline.dill');
+  Uri vmserviceIo = outDirUri.resolve('vmservice_io.dill');
   Uri librariesJson = outDirUri.resolve("lib/libraries.json");
   Uri packages = Uri.base.resolveUri(new Uri.file(packagesFile));
 
   await _writeSync(
       librariesJson.toFilePath(), JSON.encode({"libraries": locations}));
 
   if (forVm) {
     await fasta.compilePlatform(outDirUri, platform,
         packages: packages, outlineOutput: outline);
+    await fasta.compile([
+      "--sdk=${outDirUri.toString()}",
+      "--platform=${outline.toString()}",
+      "--packages=${packages.toString()}",
+      "dart:vmservice_io",
+      "-o",
+      vmserviceIo.toString()
+    ]);
   } else {
     await dart2js.compilePlatform(outDirUri, platform,
         packages: packages, outlineOutput: outline);
   }
 
   Uri platformFinalLocation = outDirUri.resolve('platform.dill');
 
   // To properly regenerate the patched_sdk, patched_dart2js_sdk, and
   // platform.dill only when necessary, we track dependencies as follows:
   //  - inputs like the sdk libraries and patch files are covered by the
@@ skipping 491 matching lines @@
     if (diff != 0) return diff;
     return end - other.end;
   }
 }
 
 List<SdkLibrary> _getSdkLibraries(String contents, bool useDart2js) {
   var libraryBuilder = new SdkLibrariesReader_LibraryBuilder(useDart2js);
   parseCompilationUnit(contents).accept(libraryBuilder);
   return libraryBuilder.librariesMap.sdkLibraries;
 }