Add library mapping.

dart/lib/compiler/implementation/compiler.dart

 // Copyright (c) 2012, 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.
 
 class WorkItem {
   final Element element;
   TreeElements resolutionTree;
   Function run;
   bool allowSpeculativeOptimization = true;
   List<HTypeGuard> guards = const <HTypeGuard>[];
@@ skipping 18 matching lines @@
     return compiler.codegen(this);
   }
 }
 
 class Compiler implements DiagnosticListener {
   Queue<WorkItem> worklist;
   Universe universe;
   String assembledCode;
   Namer namer;
   Types types;
-  final String currentDirectory;
 
   final Tracer tracer;
 
   CompilerTask measuredTask;
   Element _currentElement;
   LibraryElement coreLibrary;
   LibraryElement coreImplLibrary;
   LibraryElement isolateLibrary;
   LibraryElement jsHelperLibrary;
   LibraryElement mainApp;
@@ skipping 39 matching lines @@
   static final SourceString NO_SUCH_METHOD_EXCEPTION =
       const SourceString('NoSuchMethodException');
   static final SourceString START_ROOT_ISOLATE =
       const SourceString('startRootIsolate');
   bool enabledNoSuchMethod = false;
 
   bool workListIsClosed = false;
 
   Stopwatch codegenProgress;
 
-  Compiler.withCurrentDirectory(String this.currentDirectory,
-                                [this.tracer = const Tracer()])
+  Compiler([this.tracer = const Tracer()])
       : types = new Types(),
         universe = new Universe(),
         worklist = new Queue<WorkItem>(),
         codegenProgress = new Stopwatch.start() {
     namer = new Namer(this);
     constantHandler = new ConstantHandler(this);
     scanner = new ScannerTask(this);
     dietParser = new DietParserTask(this);
     parser = new ParserTask(this);
     validator = new TreeValidatorTask(this);
@@ skipping 111 matching lines @@
     doubleClass = coreLibrary.find(const SourceString('double'));
     stringClass = coreLibrary.find(const SourceString('String'));
     functionClass = coreLibrary.find(const SourceString('Function'));
     listClass = coreLibrary.find(const SourceString('List'));
     closureClass = jsHelperLibrary.find(const SourceString('Closure'));
     dynamicClass = jsHelperLibrary.find(const SourceString('Dynamic'));
     nullClass = jsHelperLibrary.find(const SourceString('Null'));
   }
 
   void scanBuiltinLibraries() {
-    coreImplLibrary = scanBuiltinLibrary('coreimpl.dart');
-    jsHelperLibrary = scanBuiltinLibrary('js_helper.dart');
-    coreLibrary = scanBuiltinLibrary('core.dart');
+    coreImplLibrary = scanBuiltinLibrary('coreimpl');
+    jsHelperLibrary = scanBuiltinLibrary('_js_helper');
+    coreLibrary = scanBuiltinLibrary('core');
 
     // Since coreLibrary import the libraries "coreimpl", and
     // "js_helper", coreLibrary is null when they are being built. So
     // we add the implicit import of coreLibrary now. This can be
     // cleaned up when we have proper support for "dart:core" and
     // don't need to access it through the field "coreLibrary".
     // TODO(ahe): Clean this up as described above.
     scanner.importLibrary(coreImplLibrary, coreLibrary, null);
     scanner.importLibrary(jsHelperLibrary, coreLibrary, null);
     addForeignFunctions(jsHelperLibrary);
@@ skipping 298 matching lines @@
   }
 }
 
 class SourceSpan {
   final Uri uri;
   final int begin;
   final int end;
 
   const SourceSpan(this.uri, this.begin, this.end);
 }