Cherry-pick r44373, r44378, and r44275.

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:math" as math;
@@ skipping 433 matching lines @@
    * Set the source factory used to create the sources that can be analyzed in this context to the
    * given source factory. Clients can safely assume that all analysis results have been
    * invalidated.
    *
    * @param factory the source factory used to create the sources that can be analyzed in this
    *          context
    */
   void set sourceFactory(SourceFactory factory);
 
   /**
+   * Return an array containing all of the sources known to this context.
+   *
+   * @return all of the sources known to this context
+   */
+  List<Source> get sources;
+
+  /**
    * Returns a type provider for this context or throws [AnalysisException] if
    * `dart:core` or `dart:async` cannot be resolved.
    */
   TypeProvider get typeProvider;
 
   /**
    * Add the given listener to the list of objects that are to be notified when various analysis
    * results are produced in this context.
    *
    * @param listener the listener to be added
@@ skipping 976 matching lines @@
       _sourceFactory.context = null;
     }
     factory.context = this;
     _sourceFactory = factory;
     _coreLibrarySource = _sourceFactory.forUri(DartSdk.DART_CORE);
     _asyncLibrarySource = _sourceFactory.forUri(DartSdk.DART_ASYNC);
     _cache = createCacheFromSourceFactory(factory);
     _invalidateAllLocalResolutionInformation(true);
   }
 
+  @override
+  List<Source> get sources {
+    List<Source> sources = new List<Source>();
+    MapIterator<Source, SourceEntry> iterator = _cache.iterator();
+    while (iterator.moveNext()) {
+      sources.add(iterator.key);
+    }
+    return sources;
+  }
+
   /**
    * Return a list of the sources that would be processed by [performAnalysisTask]. This
    * method duplicates, and must therefore be kept in sync with, [getNextAnalysisTask].
    * This method is intended to be used for testing purposes only.
    *
    * @return a list of the sources that would be processed by [performAnalysisTask]
    */
   List<Source> get sourcesNeedingProcessing {
     HashSet<Source> sources = new HashSet<Source>();
     bool hintsEnabled = _options.hint;
@@ skipping 10737 matching lines @@
   visitElement(Element element) {
     if (element.id == _id) {
       result = element;
       throw new _ElementByIdFinderException();
     }
     super.visitElement(element);
   }
 }
 
 class _ElementByIdFinderException {}