Issue 28149. Don't include non-Dart file into FileState.

pkg/analyzer/lib/src/dart/analysis/file_state.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:convert';
 import 'dart:typed_data';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/error/listener.dart';
@@ skipping 419 matching lines @@
     }
 
     // Build the graph.
     _importedFiles = <FileState>[];
     _exportedFiles = <FileState>[];
     _partedFiles = <FileState>[];
     _exportFilters = <NameFilter>[];
     for (UnlinkedImport import in _unlinked.imports) {
       if (!import.isImplicit) {
         String uri = import.uri;
-        if (!_isDartUri(uri)) {
+        if (_isDartFileUri(uri)) {
           FileState file = _fileForRelativeUri(uri);
           if (file != null) {
             _importedFiles.add(file);
           }
         }
       }
     }
     for (UnlinkedExportPublic export in _unlinked.publicNamespace.exports) {
       String uri = export.uri;
-      if (!_isDartUri(uri)) {
+      if (_isDartFileUri(uri)) {
         FileState file = _fileForRelativeUri(uri);
         if (file != null) {
           _exportedFiles.add(file);
           _exportFilters
               .add(new NameFilter.forUnlinkedCombinators(export.combinators));
         }
       }
     }
     for (String uri in _unlinked.publicNamespace.parts) {
-      if (!_isDartUri(uri)) {
+      if (_isDartFileUri(uri)) {
         FileState file = _fileForRelativeUri(uri);
         if (file != null) {
           _partedFiles.add(file);
           // TODO(scheglov) Sort for stable results?
           _fsState._partToLibraries
               .putIfAbsent(file, () => <FileState>[])
               .add(this);
         }
       }
     }
@@ skipping 46 matching lines @@
       return false;
     }
     for (int i = 0; i < a.length; i++) {
       if (a[i] != b[i]) {
         return false;
       }
     }
     return true;
   }
 
-  static bool _isDartUri(String uri) {
-    return uri.startsWith('dart:');
+  static bool _isDartFileUri(String uri) {
+    return !uri.startsWith('dart:') && AnalysisEngine.isDartFileName(uri);
   }
 }
 
 /**
  * Information about known file system state.
  */
 class FileSystemState {
   final PerformanceLog _logger;
   final ResourceProvider _resourceProvider;
   final ByteStore _byteStore;
@@ skipping 155 matching lines @@
         .where((f) => f._transitiveFiles == null)
         .toSet();
   }
 
   Set<FileState> get filesWithoutTransitiveSignature {
     return state._uriToFile.values
         .where((f) => f._transitiveSignature == null)
         .toSet();
   }
 }