Use package root in analysis server integration tests.

pkg/analysis_server/test/integration/integration_tests.dart

 // Copyright (c) 2014, 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 test.integration.analysis;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io';
@@ skipping 476 matching lines @@
       _notificationStreams[event] = notificationStream;
     }
     return notificationStream;
   }
 
   /**
    * Start the server.  If [debugServer] is true, the server will be started
    * with "--debug", allowing a debugger to be attached.
    */
   static Future<Server> start({bool debugServer: false}) {
+    // TODO(paulberry): move the logic for finding the script, the dart
+    // executable, and the package root into a shell script.
     String dartBinary = Platform.executable;
-    String serverPath = normalize(join(dirname(Platform.script.path), '..',
+    String scriptDir = dirname(Platform.script.path);
+    String serverPath = normalize(join(scriptDir, '..',
         '..', 'bin', 'server.dart'));
+    String repoPath = normalize(join(scriptDir, '..', '..', '..', '..'));
+    String buildDirName;
+    if (Platform.isWindows) {
+      buildDirName = 'build';
+    } else if (Platform.isMacOS){
+      buildDirName = 'xcodebuild';
+    } else {
+      buildDirName = 'out';
+    }
+    String dartConfiguration = 'ReleaseIA32'; // TODO(paulberry): this is a guess
+    String buildPath = join(repoPath, buildDirName, dartConfiguration);
+    String packageRoot = join(buildPath, 'packages');
     List<String> arguments = [];
     if (debugServer) {
       arguments.add('--debug');
     }
+    arguments.add('--package-root=$packageRoot');
     arguments.add(serverPath);
     return Process.start(dartBinary, arguments).then((Process process) {
       Server server = new Server._(process);
       process.stdout.transform((new Utf8Codec()).decoder).transform(
           new LineSplitter()).listen((String line) {
         String trimmedLine = line.trim();
         server._recordStdio('RECV: $trimmedLine');
         var message = JSON.decoder.convert(trimmedLine);
         expect(message, isMap);
         Map messageAsMap = message;
@@ skipping 92 matching lines @@
    * Record a message that was exchanged with the server, and print it out if
    * [debugStdio] has been called.
    */
   void _recordStdio(String line) {
     if (_debuggingStdio) {
       print(line);
     }
     _recordedStdio.add(line);
   }
 }