Add support for Element.docRange to the summary.

pkg/analyzer/test/src/summary/resynthesize_test.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 test.src.serialization.elements_test;
 
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/base.dart';
@@ skipping 182 matching lines @@
 
   void compareElements(
       ElementImpl resynthesized, ElementImpl original, String desc) {
     expect(resynthesized, isNotNull);
     expect(resynthesized.kind, original.kind);
     expect(resynthesized.location, original.location, reason: desc);
     expect(resynthesized.name, original.name);
     expect(resynthesized.nameOffset, original.nameOffset, reason: desc);
     expect(resynthesized.documentationComment, original.documentationComment,
         reason: desc);
+    expect(resynthesized.docRange, original.docRange, reason: desc);
     for (Modifier modifier in Modifier.values) {
       if (modifier == Modifier.MIXIN) {
         // Skipping for now.  TODO(paulberry): fix.
         continue;
       }
       bool got = resynthesized.hasModifier(modifier);
       bool want = original.hasModifier(modifier);
       expect(got, want,
           reason: 'Mismatch in $desc.$modifier: got $got, want $want');
     }
@@ skipping 1135 matching lines @@
   }
 
   test_variable_implicit_type() {
     checkLibrary('var x;');
   }
 
   test_variables() {
     checkLibrary('int i; int j;');
   }
 }