Create LibraryElement with SDK context for SDK sources.

pkg/analyzer/lib/src/task/dart.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.task.dart;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'package:analyzer/src/context/cache.dart';
@@ skipping 1402 matching lines @@
           ..setProperty(ErrorProperty.PARTS_LIBRARY_NAME, partsLibraryName);
       } else {
         error = new AnalysisError(librarySource, 0, 0,
             ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART);
       }
       errors.add(error);
     }
     //
     // Create and populate the library element.
     //
+    AnalysisContext owningContext = context;
+    if (context is InternalAnalysisContext) {
+      InternalAnalysisContext internalContext = context;
+      owningContext = internalContext.getContextFor(librarySource);
+    }
     LibraryElementImpl libraryElement =
-        new LibraryElementImpl.forNode(context, libraryNameNode);
+        new LibraryElementImpl.forNode(owningContext, libraryNameNode);
     libraryElement.definingCompilationUnit = definingCompilationUnitElement;
     libraryElement.entryPoint = entryPoint;
     libraryElement.parts = sourcedCompilationUnits;
     for (Directive directive in directivesToResolve) {
       directive.element = libraryElement;
     }
     if (sourcedCompilationUnits.isNotEmpty) {
       _patchTopLevelAccessors(libraryElement);
     }
     //
@@ skipping 2086 matching lines @@
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.first;
     _newSources.remove(currentTarget);
     return true;
   }
 }