Enable the new analysis driver by default, use --disable-new-analysis-driver to disable.

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 680 matching lines @@
     if (diagnosticPort != null) {
       arguments.add('--port');
       arguments.add(diagnosticPort.toString());
     }
     if (sdkPath != null) {
       arguments.add('--sdk=$sdkPath');
     }
     if (useAnalysisHighlight2) {
       arguments.add('--useAnalysisHighlight2');
     }
-    if (enableNewAnalysisDriver) {
-      arguments.add('--enable-new-analysis-driver');
+    if (!enableNewAnalysisDriver) {
+      arguments.add('--disable-new-analysis-driver');
     }
 //    print('Launching $serverPath');
 //    print('$dartBinary ${arguments.join(' ')}');
     return Process.start(dartBinary, arguments).then((Process process) {
       _process = process;
       process.exitCode.then((int code) {
         if (code != 0) {
           _badDataFromServer('server terminated with exit code $code');
         }
       });
@@ skipping 249 matching lines @@
   void populateMismatches(item, List<MismatchDescriber> mismatches);
 
   /**
    * Create a [MismatchDescriber] describing a mismatch with a simple string.
    */
   MismatchDescriber simpleDescription(String description) =>
       (Description mismatchDescription) {
         mismatchDescription.add(description);
       };
 }