Add summary support for ShowElementCombinator.end and .offset.

pkg/analyzer/lib/src/summary/public_namespace_computer.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.summary.public_namespace_visitor;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 
@@ skipping 14 matching lines @@
   List<String> encodeNames(NodeList<SimpleIdentifier> names) =>
       names.map((SimpleIdentifier id) => id.name).toList();
 
   @override
   UnlinkedCombinatorBuilder visitHideCombinator(HideCombinator node) {
     return new UnlinkedCombinatorBuilder(hides: encodeNames(node.hiddenNames));
   }
 
   @override
   UnlinkedCombinatorBuilder visitShowCombinator(ShowCombinator node) {
-    return new UnlinkedCombinatorBuilder(shows: encodeNames(node.shownNames));
+    return new UnlinkedCombinatorBuilder(
+        shows: encodeNames(node.shownNames),
+        offset: node.offset,
+        end: node.end);
   }
 }
 
 class _PublicNamespaceVisitor extends RecursiveAstVisitor {
   final List<UnlinkedPublicNameBuilder> names = <UnlinkedPublicNameBuilder>[];
   final List<UnlinkedExportPublicBuilder> exports =
       <UnlinkedExportPublicBuilder>[];
   final List<String> parts = <String>[];
 
   _PublicNamespaceVisitor();
@@ skipping 39 matching lines @@
             !member.isOperator) {
           String name = member.name.name;
           if (isPublic(name)) {
             cls.members.add(new UnlinkedPublicNameBuilder(
                 name: name,
                 kind: ReferenceKind.method,
                 numTypeParameters:
                     member.typeParameters?.typeParameters?.length ?? 0));
           }
         }
-        if (member is ConstructorDeclaration &&
-            member.name != null) {
+        if (member is ConstructorDeclaration && member.name != null) {
           String name = member.name.name;
           if (isPublic(name)) {
             cls.members.add(new UnlinkedPublicNameBuilder(
                 name: name,
                 kind: ReferenceKind.constructor,
                 numTypeParameters: 0));
           }
         }
       }
     }
@@ skipping 46 matching lines @@
 
   @override
   visitVariableDeclaration(VariableDeclaration node) {
     String name = node.name.name;
     addNameIfPublic(name, ReferenceKind.topLevelPropertyAccessor, 0);
     if (!node.isFinal && !node.isConst) {
       addNameIfPublic('$name=', ReferenceKind.topLevelPropertyAccessor, 0);
     }
   }
 }