Add DartSdk.getLinkedBundle() and use it in PubSummaryManager.

pkg/analyzer/lib/src/generated/sdk.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.
 
 library analyzer.src.generated.sdk;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisContext, AnalysisOptions, AnalysisOptionsImpl;
 import 'package:analyzer/src/generated/source.dart' show Source;
 import 'package:analyzer/src/generated/utilities_general.dart';
+import 'package:analyzer/src/summary/idl.dart' show PackageBundle;
 
 /**
  * A function used to create a new DartSdk with the given [options]. If the
  * passed [options] are `null`, then default options are used.
  */
 typedef DartSdk SdkCreator(AnalysisOptions options);
 
 /**
  * A Dart SDK installed in a specified location.
  */
@@ skipping 46 matching lines @@
    */
   List<String> get uris;
 
   /**
    * Return a source representing the given 'file:' [uri] if the file is in this
    * SDK, or `null` if the file is not in this SDK.
    */
   Source fromFileUri(Uri uri);
 
   /**
+   * Return the linked [PackageBundle] for this SDK, if it can be provided, or
+   * `null` otherwise.
+   *
+   * This is a temporary API, don't use it.
+   */
+  PackageBundle getLinkedBundle();
+
+  /**
    * Return the library representing the library with the given 'dart:' [uri],
    * or `null` if the given URI does not denote a library in this SDK.
    */
   SdkLibrary getSdkLibrary(String uri);
 
   /**
    * Return the source representing the library with the given 'dart:' [uri], or
    * `null` if the given URI does not denote a library in this SDK.
    */
   Source mapDartUri(String uri);
@@ skipping 458 matching lines @@
     _platforms |= DART2JS_PLATFORM;
   }
 
   /**
    * Record that this library can be run on the VM.
    */
   void setVmLibrary() {
     _platforms |= VM_PLATFORM;
   }
 }