Enable analysis without task model in AnalysisDriver.

pkg/analyzer/lib/src/dart/analysis/driver.dart

Index: pkg/analyzer/lib/src/dart/analysis/driver.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/driver.dart b/pkg/analyzer/lib/src/dart/analysis/driver.dart
index 7bb54fe9f23a8c3df130ac8e19501540ed428775..cba1690475d813ec5789ef17b96e31b303f42086 100644
--- a/pkg/analyzer/lib/src/dart/analysis/driver.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/driver.dart
@@ -72,7 +72,7 @@ class AnalysisDriver {
   /**
    * The version of data format, should be incremented on every format change.
    */
-  static const int DATA_VERSION = 21;
+  static const int DATA_VERSION = 22;
 
   /**
    * The number of exception contexts allowed to write. Once this field is
@@ -247,7 +247,7 @@ class AnalysisDriver {
       SourceFactory sourceFactory,
       this._analysisOptions,
       {PackageBundle sdkBundle,
-      this.analyzeWithoutTasks: false})
+      this.analyzeWithoutTasks: true})
       : _logger = logger,
         _sourceFactory = sourceFactory.clone(),
         _sdkBundle = sdkBundle {