Add package root support to analysis server.

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 49 matching lines @@
     initializeInttestMixin();
   }
 
   /**
    * Write a source file with the given absolute [pathname] and [contents].
    *
    * If the file didn't previously exist, it is created.  If it did, it is
    * overwritten.
    *
    * Parent directories are created as necessary.
+   *
+   * Return a normalized path to the file (with symbolic links resolved).
    */
-  void writeFile(String pathname, String contents) {
+  String writeFile(String pathname, String contents) {
     new Directory(dirname(pathname)).createSync(recursive: true);
-    new File(pathname).writeAsStringSync(contents);
+    File file = new File(pathname);
+    file.writeAsStringSync(contents);
+    return file.resolveSymbolicLinksSync();
   }
 
   /**
    * Convert the given [relativePath] to an absolute path, by interpreting it
    * relative to [sourceDirectory].  On Windows any forward slashes in
    * [relativePath] are converted to backslashes.
    */
   String sourcePath(String relativePath) {
     return join(sourceDirectory.path, relativePath.replaceAll('/', separator));
   }
@@ skipping 780 matching lines @@
    */
   void _recordStdio(String line) {
     double elapsedTime = _time.elapsedTicks / _time.frequency;
     line = "$elapsedTime: $line";
     if (_debuggingStdio) {
       print(line);
     }
     _recordedStdio.add(line);
   }
 }