First step to resolving simple API changes.

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

Index: pkg/analyzer/lib/src/generated/engine.dart
diff --git a/pkg/analyzer/lib/src/generated/engine.dart b/pkg/analyzer/lib/src/generated/engine.dart
index 26ef329a55ec0f099f398e59a26d13ee711fe412..9d50042f4bbe6748d89f6d4fc473b4cb5137ebe2 100644
--- a/pkg/analyzer/lib/src/generated/engine.dart
+++ b/pkg/analyzer/lib/src/generated/engine.dart
@@ -1137,6 +1137,26 @@ class AnalysisContextImpl implements InternalAnalysisContext {
     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);
 
@@ -5013,6 +5033,25 @@ class AnalysisContextImpl implements InternalAnalysisContext {
   }
 }
 
+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.