Add package root support to analysis server.

pkg/analysis_server/test/integration/integration_tests.dart

Index: pkg/analysis_server/test/integration/integration_tests.dart
diff --git a/pkg/analysis_server/test/integration/integration_tests.dart b/pkg/analysis_server/test/integration/integration_tests.dart
index ac9d69bc809095d74055e81aac0805fd20aa3d45..a2e188ddf45e936d4c0b2c73d68bd755a35587af 100644
--- a/pkg/analysis_server/test/integration/integration_tests.dart
+++ b/pkg/analysis_server/test/integration/integration_tests.dart
@@ -67,10 +67,14 @@ abstract class AbstractAnalysisServerIntegrationTest extends
    * 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();
   }
 
   /**