Add summary support for ShowElementCombinator.end and .offset.

pkg/analyzer/lib/src/summary/idl.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.
 
 /**
  * This file is an "idl" style description of the summary format.  It
  * contains abstract classes which declare the interface for reading data from
  * summaries.  It is parsed and transformed into code that implements the
  * summary format.
  *
@@ skipping 531 matching lines @@
   @Id(9)
   List<UnlinkedTypeParam> get typeParameters;
 }
 
 /**
  * Unlinked summary information about a `show` or `hide` combinator in an
  * import or export declaration.
  */
 abstract class UnlinkedCombinator extends base.SummaryClass {
   /**
+   * If this is a `show` combinator, offset of the end of the list of shown
+   * names.  Otherwise zero.
+   */
+  @informative
+  @Id(3)
+  int get end;
+
+  /**
    * List of names which are hidden.  Empty if this is a `show` combinator.
    */
   @Id(1)
   List<String> get hides;
 
   /**
+   * If this is a `show` combinator, offset of the `show` keyword.  Otherwise
+   * zero.
+   */
+  @informative
+  @Id(2)
+  int get offset;
+
+  /**
    * List of names which are shown.  Empty if this is a `hide` combinator.
    */
   @Id(0)
   List<String> get shows;
 }
 
 /**
  * Unlinked summary information about a compile-time constant expression, or a
  * potentially constant expression.
  *
@@ skipping 1400 matching lines @@
    */
   @Id(11)
   int get visibleLength;
 
   /**
    * If a local variable, the beginning of the visible range; zero otherwise.
    */
   @Id(12)
   int get visibleOffset;
 }