Add library mapping.

dart/lib/compiler/implementation/scanner/scanner_task.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 ScannerTask extends CompilerTask {
   ScannerTask(Compiler compiler) : super(compiler);
   String get name() => 'Scanner';
 
   void scan(CompilationUnitElement compilationUnit) {
     measure(() {
@@ skipping 17 matching lines @@
      */
     int checkTag(int value, ScriptTag tag) {
       if (tagState > value) {
         compiler.reportError(tag, 'out of order');
         return tagState;
       }
       return TagState.NEXT[value];
     }
 
     LinkBuilder<ScriptTag> imports = new LinkBuilder<ScriptTag>();
-    Uri cwd = new Uri(scheme: 'file', path: compiler.currentDirectory);
-    Uri base = cwd.resolve(library.script.name.toString());
+    Uri base = library.script.uri;
     for (ScriptTag tag in library.tags.reverse()) {
       StringNode argument = tag.argument;
       // TODO(lrn): Support interpolations here. We need access to the
       // special constants that can be inserted into script tag strings.
       Uri resolved = base.resolve(argument.dartString.slowToString());
       if (tag.isImport()) {
         tagState = checkTag(TagState.IMPORT, tag);
         // It is not safe to import other libraries at this point as
         // another library could then observe the current library
         // before it fully declares all the members that are sourced
@@ skipping 145 matching lines @@
   static final int RESOURCE = 4;
 
   /** Next state. */
   static final List<int> NEXT =
       const <int>[NO_TAG_SEEN,
                   IMPORT, // Only one library tag is allowed.
                   IMPORT,
                   SOURCE,
                   RESOURCE];
 }