Fix for missing LineInfo to SDK entries.

pkg/analyzer/lib/src/generated/engine.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine;
 
 import 'dart:collection';
@@ skipping 1521 matching lines @@
     return namespace;
   }
 
   @override
   List<Source> get refactoringUnsafeSources {
     List<Source> sources = new List<Source>();
     MapIterator<Source, SourceEntry> iterator = _cache.iterator();
     while (iterator.moveNext()) {
       SourceEntry sourceEntry = iterator.value;
       if (sourceEntry is DartEntry) {
-        if (!sourceEntry.isRefactoringSafe) {
-          sources.add(iterator.key);
+        Source source = iterator.key;
+        if (!source.isInSystemLibrary && !sourceEntry.isRefactoringSafe) {
+          sources.add(source);
         }
       }
     }
-    return new List.from(sources);
+    return sources;
   }
 
   @override
   CompilationUnit getResolvedCompilationUnit(Source unitSource, LibraryElement library) {
     if (library == null) {
       return null;
     }
     return getResolvedCompilationUnit2(unitSource, library.source);
   }
 
@@ skipping 10409 matching lines @@
   static int _DEFAULT_SDK_CACHE_SIZE = 256;
 
   /**
    * Clear any cached data being maintained by this manager.
    */
   void clearCache() {
     _sdkPartitions.clear();
   }
 
   /**
-   * Return the partition being used for the given SDK, creating the partition if necessary.
+   * Return the partition being used for the given SDK, creating the partition
+   * if necessary.
    *
-   * @param sdk the SDK for which a partition is being requested
-   * @return the partition being used for the given SDK
+   * [sdk] - the SDK for which a partition is being requested.
    */
   SdkCachePartition forSdk(DartSdk sdk) {
+    // Call sdk.context now, because when it creates a new
+    // InternalAnalysisContext instance, it calls forSdk() again, so creates an
+    // SdkCachePartition instance.
+    // So, if we initialize context after "partition == null", we end up
+    // with two SdkCachePartition instances.
+    InternalAnalysisContext sdkContext = sdk.context;
+    // Check cache for an existing partition.
     SdkCachePartition partition = _sdkPartitions[sdk];
     if (partition == null) {
-      partition = new SdkCachePartition(sdk.context as InternalAnalysisContext, _DEFAULT_SDK_CACHE_SIZE);
+      partition = new SdkCachePartition(sdkContext, _DEFAULT_SDK_CACHE_SIZE);
       _sdkPartitions[sdk] = partition;
     }
     return partition;
   }
 }
 
 /**
  * Container with global [AnalysisContext] performance statistics.
  */
 class PerformanceStatistics {
@@ skipping 2554 matching lines @@
     _index++;
     if (_index >= _manager._workQueues[_queueIndex].length) {
       _index = 0;
       _queueIndex++;
       while (_queueIndex < _manager._workQueues.length && _manager._workQueues[_queueIndex].isEmpty) {
         _queueIndex++;
       }
     }
   }
 }