Set fileUri when creating library builders.

pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart

 // Copyright (c) 2016, 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 fasta.kernel_library_builder;
 
 import 'package:kernel/ast.dart';
 
 import 'package:kernel/clone.dart' show
     CloneVisitor;
@@ skipping 42 matching lines @@
     TypeVariableBuilder;
 
 class KernelLibraryBuilder
     extends SourceLibraryBuilder<KernelTypeBuilder, Library> {
   final Library library;
 
   final List<Class> mixinApplicationClasses = <Class>[];
 
   final List<List> argumentsWithMissingDefaultValues = <List>[];
 
-  KernelLibraryBuilder(Uri uri, Loader loader)
+  KernelLibraryBuilder(Uri uri, Uri fileUri, Loader loader)
       : library = new Library(uri),
-        super(loader);
+        super(loader, fileUri);
 
   Uri get uri => library.importUri;
 
   KernelTypeBuilder addInterfaceType(String name,
       List<KernelTypeBuilder> arguments) {
     KernelInterfaceTypeBuilder type =
         new KernelInterfaceTypeBuilder(name, arguments);
     if (identical(name, "dynamic")) {
       // TODO(ahe): Make const.
       type.builder = new DynamicTypeBuilder(const DynamicType());
@@ skipping 134 matching lines @@
     } else if (builder is PrefixBuilder) {
       // Ignored. Kernel doesn't represent prefixes.
     } else {
       internalError("Unhandled builder: ${builder.runtimeType}");
     }
   }
 
   Library build() {
     super.build();
     library.name = name;
-    // TODO(ahe): Set fileUri.
-    // library.fileUri = "${fileUri ?? uri}";
     return library;
   }
 
   Builder buildAmbiguousBuilder(
       String name, Builder builder, Builder other) {
     if (builder.next == null && other.next == null) {
       if (builder.isGetter && other.isSetter) {
         return new MixedAccessor(builder, other);
       } else if (builder.isSetter && other.isGetter) {
         return new MixedAccessor(other, builder);
@@ skipping 40 matching lines @@
           }
           expression.value =
               defaultArgumentFrom(names[expression.name].initializer)
               ..parent = expression;
         }
       }
     }
     return argumentsWithMissingDefaultValues.length;
   }
 }