Fix analysis.getNavigation with the new analysis driver.

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

 // Copyright (c) 2016, 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.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:typed_data';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart' show CompilationUnitElement;
@@ skipping 830 matching lines @@
       {String content, bool withErrors: true, CompilationUnit resolvedUnit}) {
     var unit = new AnalysisDriverResolvedUnit.fromBuffer(bytes);
     List<AnalysisError> errors = withErrors
         ? _getErrorsFromSerialized(file, unit.errors)
         : const <AnalysisError>[];
     return new AnalysisResult(
         this,
         _sourceFactory,
         file.path,
         file.uri,
+        file.exists,
         content,
         file.contentHash,
         file.lineInfo,
         resolvedUnit,
         errors,
         unit.index);
   }
 
   /**
    * Return [AnalysisError]s for the given [serialized] errors.
@@ skipping 443 matching lines @@
   final String path;
 
   /**
    * The URI of the file that corresponded to the [path] in the used
    * [SourceFactory] at some point. Is it not guaranteed to be still consistent
    * to the [path], and provided as FYI.
    */
   final Uri uri;
 
   /**
+   * Return `true` if the file exists.
+   */
+  final bool exists;
+
+  /**
    * The content of the file that was scanned, parsed and resolved.
    */
   final String content;
 
   /**
    * The MD5 hash of the [content].
    */
   final String contentHash;
 
   /**
@@ skipping 14 matching lines @@
   /**
    * The index of the unit.
    */
   final AnalysisDriverUnitIndex _index;
 
   AnalysisResult(
       this.driver,
       this.sourceFactory,
       this.path,
       this.uri,
+      this.exists,
       this.content,
       this.contentHash,
       this.lineInfo,
       this.unit,
       this.errors,
       this._index);
 }
 
 /**
  * Exception that happened during analysis.
@@ skipping 254 matching lines @@
           libraryDeclarations.add(new TopLevelDeclarationInSource(
               file.source, declaration, isExported));
         }
       }
     }
 
     // We're not done yet.
     return false;
   }
 }