Update worker mode to use the bazel protos directly instead of json

pkg/analyzer_cli/test/utils.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.
 
 library analyzer_cli.test.utils;
 
+import 'dart:collection';
 import 'dart:io';
 import 'dart:mirrors';
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:path/path.dart' as pathos;
 import 'package:path/path.dart' as path;
+import 'package:typed_mock/typed_mock.dart';
 import 'package:unittest/unittest.dart';
 
 /// Gets the test directory in a way that works with
 /// package:test and package:unittest.
 /// See <https://github.com/dart-lang/test/issues/110> for more info.
 final String testDirectory = pathos.dirname(
     pathos.fromUri((reflectClass(_TestUtils).owner as LibraryMirror).uri));
 
 /// Returns the string representation of the [AnalyzerErrorGroup] thrown when
 /// parsing [contents] as a Dart file. If [contents] doesn't throw any errors,
@@ skipping 32 matching lines @@
 dynamic withTempDir(fn(String path)) {
   var tempDir = Directory.systemTemp.createTempSync('analyzer_').path;
   try {
     return fn(tempDir);
   } finally {
     new Directory(tempDir).deleteSync(recursive: true);
   }
 }
 
 class _TestUtils {}
+
+/**
+ * A [Stdin] mock.
+ */
+class TestStdinStream extends TypedMock implements Stdin {
+  final pendingBytes = new Queue<int>();
+
+  // Adds all the input bytes to this stream.
+  void addInputBytes(List<int> bytes) {
+    pendingBytes.addAll(bytes);
+  }
+
+  @override
+  int readByteSync() {
+    if (pendingBytes.isEmpty) {
+      return -1;
+    } else {
+      return pendingBytes.removeFirst();
+    }
+  }
+}
+
+/**
+ * A [Stdout] mock.
+ */
+class TestStdoutStream extends TypedMock implements Stdout {
+  final writes = <List<int>>[];
+
+  @override
+  void add(List<int> bytes) {
+    super.add(bytes);
+    writes.add(bytes);
+  }
+}