simplify computing of runtime file locations

lib/src/codegen/html_codegen.dart

 // Copyright (c) 2015, 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 dev_compiler.src.codegen.html_codegen;
 
 import 'package:html/dom.dart';
 import 'package:html/parser.dart' show parseFragment;
 import 'package:logging/logging.dart' show Logger;
 import 'package:path/path.dart' as path;
@@ skipping 33 matching lines @@
   var resources = new Set();
   visitInPostOrder(root, (n) {
     if (n is DartSourceNode) libraries.add(n);
     if (n is ResourceSourceNode) resources.add(n);
   }, includeParts: false);
 
   root.htmlResourceNodes.forEach((element, resource) {
     // Make sure we don't try and add this node again.
     resources.remove(resource);
 
-    var resourcePath = resourceOutputPath(resource.uri, root.uri);
+    var resourcePath =
+        resourceOutputPath(resource.uri, root.uri, options.runtimeDir);
     if (resource.cachingHash != null) {
       resourcePath = _addHash(resourcePath, resource.cachingHash);
     }
     var attrs = element.attributes;
     if (attrs.containsKey('href')) {
       attrs['href'] = resourcePath;
     } else if (attrs.containsKey('src')) {
       attrs['src'] = resourcePath;
     }
   });
 
   var fragment = new DocumentFragment();
   for (var resource in resources) {
-    var resourcePath = resourceOutputPath(resource.uri, root.uri);
+    var resourcePath =
+        resourceOutputPath(resource.uri, root.uri, options.runtimeDir);
     var ext = path.extension(resourcePath);
     if (resource.cachingHash != null) {
       resourcePath = _addHash(resourcePath, resource.cachingHash);
     }
     if (ext == '.js') {
       fragment.nodes.add(_libraryInclude(resourcePath));
     } else if (ext == '.css') {
       var stylesheetLink = '<link rel="stylesheet" href="$resourcePath">\n';
       fragment.nodes.add(parseFragment(stylesheetLink));
     }
@@ skipping 31 matching lines @@
 
 /// Convert the outputPath to include the hash in it. This function is the
 /// reverse of what the server does to determine whether a request needs to have
 /// cache headers added to it.
 _addHash(String outPath, String hash) {
   // (the ____ prefix makes it look better in the web inspector)
   return '$outPath?____cached=$hash';
 }
 
 final _log = new Logger('dev_compiler.src.codegen.html_codegen');