Add CompilationUnitElement.lineInfo and resynthesize it.

pkg/analyzer/test/src/summary/resynthesize_common.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/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 242 matching lines @@
       expect(r.hasBeenInferred, o.hasBeenInferred, reason: desc);
     }
   }
 
   void compareCompilationUnitElements(CompilationUnitElementImpl resynthesized,
       CompilationUnitElementImpl original) {
     String desc = 'Compilation unit ${original.source.uri}';
     compareUriReferencedElements(resynthesized, original, desc);
     expect(resynthesized.source, original.source);
     expect(resynthesized.librarySource, original.librarySource);
+    compareLineInfo(resynthesized.lineInfo, original.lineInfo);
     expect(resynthesized.types.length, original.types.length,
         reason: '$desc types');
     for (int i = 0; i < resynthesized.types.length; i++) {
       compareClassElements(
           resynthesized.types[i], original.types[i], original.types[i].name);
     }
     expect(resynthesized.topLevelVariables.length,
         original.topLevelVariables.length,
         reason: '$desc topLevelVariables');
     for (int i = 0; i < resynthesized.topLevelVariables.length; i++) {
@@ skipping 541 matching lines @@
 
   void compareLabelElements(
       LabelElementImpl resynthesized, LabelElementImpl original, String desc) {
     expect(resynthesized.isOnSwitchMember, original.isOnSwitchMember,
         reason: desc);
     expect(resynthesized.isOnSwitchStatement, original.isOnSwitchStatement,
         reason: desc);
     compareElements(resynthesized, original, desc);
   }
 
+  void compareLineInfo(LineInfo resynthesized, LineInfo original) {
+    expect(resynthesized.lineCount, original.lineCount);
+    expect(resynthesized.lineStarts, original.lineStarts);
+  }
+
   void compareLocalElementsOfExecutable(ExecutableElement resynthesized,
       ExecutableElement original, String desc) {
     if (original is! Member) {
       List<FunctionElement> rFunctions = resynthesized.functions;
       List<FunctionElement> oFunctions = original.functions;
       expect(rFunctions, hasLength(oFunctions.length));
       for (int i = 0; i < oFunctions.length; i++) {
         compareFunctionElements(rFunctions[i], oFunctions[i],
             '$desc local function ${oFunctions[i].name}');
       }
@@ skipping 4430 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }