Move the dart2js snapshot into bin directory of sdk root.

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"]);
+
+  return getVersion(options, rootPath).then((version) {
+    var snapshotGenerationText = 
+"""
+import '${dart2js}' as dart2jsMain;
+import 'dart:io';
+
+void main() {
+  Options options = new Options();
+  if (options.arguments.length < 1) throw "No tool given as argument";
+  String tool = options.arguments.removeAt(0);
+  if (tool == "dart2js") {
+    dart2jsMain.BUILD_ID = "$version";
+    dart2jsMain.mainWithErrorHandler(options);
+  }
+}
+
+""";
+    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) {
+  return Process.run(options.executable,
+                     ["--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 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 $argument";
+    }
+    args[argumentSplit[0].substring(2)] = argumentSplit[1];
+  }
+  if (!args.containsKey("dart2js_main")) throw "Please specify dart2js_main";
+  if (!args.containsKey("output_dir")) throw "Please specify output_dir";
+
+  var scriptFile = new File(options.script);
+  var path = new Path(scriptFile.directorySync().path); 
+  var rootPath = path.directoryPath.directoryPath;
+
+  getSnapshotGenerationFile(options, args, rootPath).then((result) {
+    var wrapper = "${args['output_dir']}/utils_wrapper.dart";
+    writeSnapshotFile(wrapper, result);
+    createSnapshot(options, wrapper);
+  });
+}