Add Dartdoc testing to pub bots.

sdk/lib/_internal/dartdoc/dartdoc.status

Index: sdk/lib/_internal/dartdoc/dartdoc.status
diff --git a/sdk/lib/_internal/dartdoc/dartdoc.status b/sdk/lib/_internal/dartdoc/dartdoc.status
new file mode 100644
index 0000000000000000000000000000000000000000..8b45e64353f9f62f392c7c2fd23f6f8f9fa3feb0
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+++ b/sdk/lib/_internal/dartdoc/dartdoc.status
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+# 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.
+
+test/markdown_test: Pass
+test/dartdoc_test: Pass
+test/dartdoc_search_test: Pass, Skip
+
+# Dartdoc only runs on the VM, so just rule out all compilers.
+[ $compiler == dart2js || $compiler == dart2dart || $compiler == dartc ]
+*: Skip
+
+# Dartdoc only runs on the standalone VM, not in dartium.
+[ $runtime == drt || $runtime == dartium ]
+*: Skip