Entries for relatively referenced system libraries to prevent duplicate resolution

compiler/java/com/google/dart/compiler/SystemLibraryManager.java

 // Copyright (c) 2011, 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.
 
 package com.google.dart.compiler;
 
 import com.google.common.collect.Lists;
 
 import java.io.BufferedInputStream;
 import java.io.File;
@@ skipping 231 matching lines @@
           addLib(shortName, host, host, child, dartFile.getName());
         }
       } else {
         // Otherwise treat the entry as an explicit shortName to dart file mapping
         int index = shortName.indexOf(':');
         if (index == -1) {
           continue;
         }
         explicitShortNames.add(shortName);
         String scheme = shortName.substring(0, index + 1);
-        String host = shortName.substring(index + 1);
-        addLib(scheme, host, host, file.getParentFile(), file.getName());
+        String name = shortName.substring(index + 1);
+        index = name.indexOf('/');
+        String host = index > 0 ? name.substring(0, index) : name;
+        addLib(scheme, host, name, file.getParentFile(), file.getName());
       }
     }
     return libraries.toArray(new SystemLibrary[libraries.size()]);
   }
   
   /**
    * Read the import.config content and return it as a collection of key/value pairs
    */
   protected Properties getImportConfig() {
     Properties importConfig = new Properties();
@@ skipping 49 matching lines @@
       if (existingLib != null) {
         libraries.remove(existingLib);
       }
       libraries.add(library);
       hostMap.put(host, library);
       expansionMap.put(library.getShortName(),
           "//" + host + "/" + library.getPathToLib());
     }
   }
 }