Add line starts into unlinked units.

pkg/analyzer/lib/src/summary/summarize_ast.dart

Index: pkg/analyzer/lib/src/summary/summarize_ast.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_ast.dart b/pkg/analyzer/lib/src/summary/summarize_ast.dart
index eeaef9dbf4fd0df31722019f4a1dfaa837040991..dd809067f5b1663e4dd8599fb431ab39bd6741dd 100644
--- a/pkg/analyzer/lib/src/summary/summarize_ast.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_ast.dart
@@ -17,8 +17,10 @@ import 'package:analyzer/src/summary/summarize_const_expr.dart';
 /**
  * Serialize all the declarations in [compilationUnit] to an unlinked summary.
  */
-UnlinkedUnitBuilder serializeAstUnlinked(CompilationUnit compilationUnit) {
-  return new _SummarizeAstVisitor().serializeCompilationUnit(compilationUnit);
+UnlinkedUnitBuilder serializeAstUnlinked(
+    CompilationUnit compilationUnit, List<int> lineStarts) {
+  return new _SummarizeAstVisitor()
+      .serializeCompilationUnit(compilationUnit, lineStarts);
 }
 
 /**
@@ -504,13 +506,14 @@ class _SummarizeAstVisitor extends RecursiveAstVisitor {
    * Main entry point for serializing an AST.
    */
   UnlinkedUnitBuilder serializeCompilationUnit(
-      CompilationUnit compilationUnit) {
+      CompilationUnit compilationUnit, List<int> lineStarts) {
     compilationUnit.directives.accept(this);
     if (!hasCoreBeenImported) {
       unlinkedImports.add(new UnlinkedImportBuilder(isImplicit: true));
     }
     compilationUnit.declarations.accept(this);
     UnlinkedUnitBuilder b = new UnlinkedUnitBuilder();
+    b.lineStarts = lineStarts;
     b.libraryName = libraryName;
     b.libraryNameOffset = libraryNameOffset;
     b.libraryNameLength = libraryNameLength;