Add dartdoc to the generated utils snapshot

utils/compiler/create_snapshot.dart

 // Copyright (c) 2013, 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.
 
 import 'dart:io';
 
 Future<String> getVersion(var options, var rootPath) {
   var versionPath = rootPath.append("tools").append("version.dart");
   return Process.run(options.executable,
                      [versionPath.toNativePath()])
       .then((result) {
         if (result.exitCode != 0) {
           throw "Could not generate version";
         }
         return result.stdout.trim();
       });
 }
 
 Future<String> getSnapshotGenerationFile(var options, var args, var rootPath) {
   var dart2js = rootPath.append(args["dart2js_main"]);
+  var dartdoc = rootPath.append(args["dartdoc_main"]);
 
   return getVersion(options, rootPath).then((version) {
     var snapshotGenerationText = 
 """
 import '${dart2js}' as dart2jsMain;
+import '${dartdoc}' as dartdocMain;
 import 'dart:io';
 
 void main() {
   Options options = new Options();
   if (options.arguments.length < 1) throw "No tool given as argument";
   String tool = options.arguments.removeAt(0);
   if (tool == "dart2js") {
     dart2jsMain.BUILD_ID = "$version";
     dart2jsMain.mainWithErrorHandler(options);
+  } else if (tool == "dartdoc") {
+    dartdocMain.mainWithOptions(options);
   }
 }
 
 """;
     return snapshotGenerationText;
   });
 }
 
 void writeSnapshotFile(var path, var content) {
     File file = new File(path);
     var writer = file.openSync(mode: FileMode.WRITE);
     writer.writeStringSync(content);
     writer.close();
 }
 
-Future createSnapshot(var options, var dart_file) {
+Future createSnapshot(var options, var dart_file, var packageRoot) {
   return Process.run(options.executable,
-                     ["--generate-script-snapshot=$dart_file.snapshot",
+                     ["--package-root=$packageRoot",
+                      "--generate-script-snapshot=$dart_file.snapshot",
                       dart_file])
       .then((result) {
         if (result.exitCode != 0) {
           throw "Could not generate snapshot";
         }
       });
 }
 
 /**
  * Takes the following arguments:
  * --output_dir=val     The full path to the output_dir.
  * --dart2js_main=val   The path to the dart2js main script releative to root.
  */
 void main() { 
   Options options = new Options();
-  var validArguments = ["--output_dir", "--dart2js_main"];
+  var validArguments = ["--output_dir", "--dart2js_main", "--dartdoc_main",
+                        "--package_root"];
   var args = {};
   for (var argument in options.arguments) {
     var argumentSplit = argument.split("=");
     if (argumentSplit.length != 2) throw "Invalid argument $argument, no =";
     if (!validArguments.contains(argumentSplit[0])) {
       throw "Invalid argument $argument";
     }
     args[argumentSplit[0].substring(2)] = argumentSplit[1];
   }
   if (!args.containsKey("dart2js_main")) throw "Please specify dart2js_main";
+  if (!args.containsKey("dartdoc_main")) throw "Please specify dartdoc_main";
   if (!args.containsKey("output_dir")) throw "Please specify output_dir";
+  if (!args.containsKey("package_root")) throw "Please specify package_root";
 
   var scriptFile = new File(options.script);
   var path = new Path(scriptFile.directorySync().path); 
   var rootPath = path.directoryPath.directoryPath;
 
   getSnapshotGenerationFile(options, args, rootPath).then((result) {
     var wrapper = "${args['output_dir']}/utils_wrapper.dart";
     writeSnapshotFile(wrapper, result);
-    createSnapshot(options, wrapper);
+    createSnapshot(options, wrapper, args["package_root"]);
   });
 }