First step to resolving simple API changes.

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 1119 matching lines @@
       if (sourceEntry.kind == SourceKind.LIBRARY && !source.isInSystemLibrary) {
 //          DartEntry dartEntry = (DartEntry) sourceEntry;
 //          if (dartEntry.getValue(DartEntry.IS_LAUNCHABLE) && !dartEntry.getValue(DartEntry.IS_CLIENT)) {
         sources.add(source);
 //          }
       }
     }
     return sources;
   }
 
+  Element findElementById(int id) {
+    _ElementByIdFinder finder = new _ElementByIdFinder(id);
+    try {
+      MapIterator<Source, SourceEntry> iterator = _cache.iterator();
+      while (iterator.moveNext()) {
+        SourceEntry sourceEntry = iterator.value;
+        if (sourceEntry.kind == SourceKind.LIBRARY) {
+          DartEntry dartEntry = sourceEntry;
+          LibraryElement library = dartEntry.getValue(DartEntry.ELEMENT);
+          if (library != null) {
+            library.accept(finder);
+          }
+        }
+      }
+    } on _ElementByIdFinderException catch (e) {
+      return finder.result;
+    }
+    return null;
+  }
+
   @override
   List<Source> get librarySources => _getSources(SourceKind.LIBRARY);
 
   /**
    * Look through the cache for a task that needs to be performed. Return the task that was found,
    * or `null` if there is no more work to be done.
    *
    * @return the next task that needs to be performed
    */
   AnalysisTask get nextAnalysisTask {
@@ skipping 3856 matching lines @@
       for (Source source in missingSources) {
         buffer.write("    ");
         buffer.writeln(source.fullName);
       }
       _logInformation(buffer.toString());
     }
     return changedSources.length > 0;
   }
 }
 
+class _ElementByIdFinder extends GeneralizingElementVisitor {
+  final int _id;
+  Element result;
+
+  _ElementByIdFinder(this._id);
+
+  @override
+  visitElement(Element element) {
+    if (element.id == _id) {
+      result = element;
+      throw new _ElementByIdFinderException();
+    }
+    super.visitElement(element);
+  }
+}
+
+class _ElementByIdFinderException {
+}
+
 /**
  * An `AnalysisTaskResultRecorder` is used by an analysis context to record the
  * results of a task.
  */
 class AnalysisContextImpl_AnalysisTaskResultRecorder implements
     AnalysisTaskVisitor<SourceEntry> {
   final AnalysisContextImpl AnalysisContextImpl_this;
 
   AnalysisContextImpl_AnalysisTaskResultRecorder(this.AnalysisContextImpl_this);
 
@@ skipping 9911 matching lines @@
 
   @override
   Object visitPolymerTagDartElement(PolymerTagDartElement element) {
     if (element.name == PolymerHtmlUnitBuilder_this._elementName) {
       throw new PolymerHtmlUnitBuilder_FoundTagDartElementError(
           element as PolymerTagDartElementImpl);
     }
     return null;
   }
 }