Add line starts into unlinked units.

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 2642 matching lines @@
 
   /**
    * Offset of the library name relative to the beginning of the file (or 0 if
    * the library has no name).
    */
   @informative
   @Id(8)
   int get libraryNameOffset;
 
   /**
+   * Offsets of the first character of each line in the source code.
+   */
+  @informative
+  @Id(17)
+  List<int> get lineStarts;
+
+  /**
    * Part declarations in the compilation unit.
    */
   @Id(11)
   List<UnlinkedPart> get parts;
 
   /**
    * Unlinked public namespace of this compilation unit.
    */
   @Id(0)
   UnlinkedPublicNamespace get publicNamespace;
@@ skipping 120 matching lines @@
    */
   @Id(11)
   int get visibleLength;
 
   /**
    * If a local variable, the beginning of the visible range; zero otherwise.
    */
   @Id(12)
   int get visibleOffset;
 }