Prepare for development branch by updating externally-used API.

pkg/front_end/lib/src/fasta/source/source_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.source_library_builder;
 
 import 'package:front_end/src/scanner/token.dart' show Token;
 
 import 'package:front_end/src/fasta/scanner/token.dart' show SymbolToken;
 
@@ skipping 104 matching lines @@
   DeclarationBuilder<T> endNestedDeclaration() {
     DeclarationBuilder<T> previous = currentDeclaration;
     currentDeclaration = currentDeclaration.parent;
     return previous;
   }
 
   Uri resolve(String path) => uri.resolve(path);
 
   void addExport(List<MetadataBuilder> metadata, String uri,
       Unhandled conditionalUris, List<Combinator> combinators, int charOffset) {
-    loader.read(resolve(uri)).addExporter(this, combinators, charOffset);
+    loader
+        .read(resolve(uri), charOffset, accessor: this)
+        .addExporter(this, combinators, charOffset);
   }
 
   void addImport(
       List<MetadataBuilder> metadata,
       String uri,
       Unhandled conditionalUris,
       String prefix,
       List<Combinator> combinators,
       bool deferred,
       int charOffset,
       int prefixCharOffset) {
-    imports.add(new Import(this, loader.read(resolve(uri)), deferred, prefix,
-        combinators, charOffset, prefixCharOffset));
+    imports.add(new Import(
+        this,
+        loader.read(resolve(uri), charOffset, accessor: this),
+        deferred,
+        prefix,
+        combinators,
+        charOffset,
+        prefixCharOffset));
   }
 
   void addPart(List<MetadataBuilder> metadata, String path) {
     Uri resolvedUri;
     Uri newFileUri;
     if (uri.scheme == "dart") {
       resolvedUri = new Uri(scheme: "dart", path: "${uri.path}/$path");
       newFileUri = fileUri.resolve(path);
     } else {
       resolvedUri = uri.resolve(path);
+
+      // TODO(ahe): This is wrong for package URIs.
       newFileUri = fileUri.resolve(path);
     }
-    parts.add(loader.read(resolvedUri, newFileUri));
+    parts
+        .add(loader.read(resolvedUri, -1, fileUri: newFileUri, accessor: this));
   }
 
   void addPartOf(List<MetadataBuilder> metadata, String name, String uri) {
     partOfName = name;
     partOfUri = uri == null ? null : this.uri.resolve(uri);
   }
 
   void addClass(
       List<MetadataBuilder> metadata,
       int modifiers,
@@ skipping 394 matching lines @@
   /// synthesize type variables on the factory matching the class'.
   void addFactoryDeclaration(
       ProcedureBuilder procedure, DeclarationBuilder<T> factoryDeclaration) {
     factoryDeclarations[procedure] = factoryDeclaration;
   }
 
   Scope toScope(Scope parent) {
     return new Scope(members, setters, parent, isModifiable: false);
   }
 }