Move sunflower to a new directory, make final tweaks to make it all work.

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:html5lib/dom.dart';
 import 'package:html5lib/parser.dart' show parseFragment;
 import 'package:logging/logging.dart' show Logger;
 import 'package:path/path.dart' as path;
@@ skipping 38 matching lines @@
     if (n is ResourceSourceNode) resources.add(n);
   }, includeParts: false);
 
   String mainLibraryName;
   var fragment = new DocumentFragment();
   for (var resource in resources) {
     var resourcePath = resourceOutputPath(resource.uri, root.uri);
     if (resource.cachingHash != null) {
       resourcePath = _addHash(resourcePath, resource.cachingHash);
     }
-    if (path.extension(resourcePath) == '.css') {
+    var ext = path.extension(resourcePath);
+    if (ext == '.css') {
       fragment.nodes.add(_cssInclude(resourcePath));
-    } else {
+    } else if (ext == '.js') {
       fragment.nodes.add(_libraryInclude(resourcePath));
     }
   }
-  if (!options.checkSdk) fragment.nodes.add(_miniMockSdk);
   for (var lib in libraries) {
     var info = lib.info;
     if (info == null) continue;
     if (info.isEntry) mainLibraryName = jsLibraryName(info.library);
     var jsPath = jsOutputPath(info, root.uri);
     if (lib.cachingHash != null) {
       jsPath = _addHash(jsPath, lib.cachingHash);
     }
     fragment.nodes.add(_libraryInclude(jsPath));
   }
@@ skipping 18 matching lines @@
   return parseFragment('<script>$code</script>\n');
 }
 
 /// 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) {
   return path.join('cached', hash, outPath);
 }
 
-/// A script tag with a tiny mock of the core SDK. This is just used for testing
-/// some small samples.
-// TODO(sigmund,jmesserly): remove.
-Node get _miniMockSdk => parseFragment('''
-<script>
-  /* placehorder for unimplemented code libraries */
-  var math = Math;
-  var core = { int: { parse: Number }, print: e => console.log(e) };
-</script>''');
 final _log = new Logger('dev_compiler.src.codegen.html_codegen');