Make dartdoc compile.

dart/tests/utils/src/DummyCompilerTest.dart

+// Copyright (c) 2012, 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.
+
+// Smoke test of the dart2js compiler API.
+
+#import('../../../frog/leg/api.dart');
+#import('../../../lib/uri/uri.dart');
+
+Future<String> provider(Uri uri) {
+  Completer<String> completer = new Completer<String>();
+  String source;
+  if (uri.scheme == "main") {
+    source = "main() {}";
+  } else {
+    source = "";
+  }
+  completer.complete(source);
+  return completer.future;
+}
+
+void handler(Uri uri, int begin, int end, String message, bool fatal) {
+  print(message);
+}
+
+main() {
+  String code = compile(new Uri(scheme: 'main'), new Uri(scheme: 'lib'),
+                        provider, handler).value;
+  if (code === null) {
+    throw 'Compilation failed';
+  }
+}