Migrate DDC to the new analysis driver.

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

Index: pkg/analyzer/lib/src/dart/analysis/file_tracker.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/file_tracker.dart b/pkg/analyzer/lib/src/dart/analysis/file_tracker.dart
index aa34c330ee5e599ed87680bd815bb182a2cc67e1..56e447d3439b6144aca360373b5b86cbbfeedb4d 100644
--- a/pkg/analyzer/lib/src/dart/analysis/file_tracker.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/file_tracker.dart
@@ -11,6 +11,7 @@ import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/summary/package_bundle_reader.dart';
 
 /**
  * Callback used by [FileTracker] to report to its client that files have been
@@ -53,6 +54,11 @@ class FileTracker {
   final addedFiles = new LinkedHashSet<String>();
 
   /**
+   * TODO(scheglov) document
+   */
+  final SummaryDataStore externalSummaries;
+
+  /**
    * The set of files were reported as changed through [changeFile] and not
    * checked for actual changes yet.
    */
@@ -71,9 +77,11 @@ class FileTracker {
       SourceFactory sourceFactory,
       AnalysisOptions analysisOptions,
       Uint32List salt,
+      this.externalSummaries,
       this._changeHook)
       : fsState = new FileSystemState(logger, byteStore, contentOverlay,
-            resourceProvider, sourceFactory, analysisOptions, salt);
+            resourceProvider, sourceFactory, analysisOptions, salt,
+            externalSummaries: externalSummaries);
 
   /**
    * Returns the path to exactly one that needs analysis.  Throws a [StateError]