Manage 'libraries containing part' in DartWorkManager.

pkg/analyzer/lib/src/context/context.dart

 // Copyright (c) 2015, 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 analyzer.src.context.context;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/cancelable_future.dart';
@@ skipping 789 matching lines @@
     }
     return SourceKind.UNKNOWN;
   }
 
   @override
   List<Source> getLibrariesContaining(Source source) {
     SourceKind kind = getKindOf(source);
     if (kind == SourceKind.LIBRARY) {
       return <Source>[source];
     } else if (kind == SourceKind.PART) {
-      List<Source> libraries = <Source>[];
-      for (Source library in _cache.sources) {
-        CacheEntry entry = _cache.get(library);
-        if (entry.getValue(SOURCE_KIND) == SourceKind.LIBRARY) {
-          List<Source> parts = entry.getValue(INCLUDED_PARTS);
-          if (parts.contains(source)) {
-            libraries.add(library);
-          }
-        }
-      }
-      if (libraries.isNotEmpty) {
-        return libraries;
-      }
+      return dartWorkManager.getLibrariesContainingPart(source);
     }
     return Source.EMPTY_ARRAY;
   }
 
   @override
   List<Source> getLibrariesDependingOn(Source librarySource) {
     List<Source> dependentLibraries = <Source>[];
     for (Source source in _cache.sources) {
       CacheEntry entry = _cache.get(source);
       if (entry.getValue(SOURCE_KIND) == SourceKind.LIBRARY) {
@@ skipping 1173 matching lines @@
     PendingFuture pendingFuture =
         new PendingFuture<T>(_context, target, computeValue);
     if (!pendingFuture.evaluate(entry)) {
       _context._pendingFutureTargets
           .putIfAbsent(target, () => <PendingFuture>[])
           .add(pendingFuture);
     }
     return pendingFuture.future;
   }
 }