Allow test.py to run dartdoc tests. Run dartdoc tests on pub bots.

tools/bots/pub.py

Index: tools/bots/pub.py
diff --git a/tools/bots/pub.py b/tools/bots/pub.py
index 7f177e073b6b16c2cb5651d9858bf92fc4cc7a26..deb9b6d2b543c8a012925cbf8bb6ef7d38a327b8 100755
--- a/tools/bots/pub.py
+++ b/tools/bots/pub.py
@@ -37,9 +37,12 @@ def PubConfig(name, is_buildbot):
 
 def PubSteps(build_info):
   pub_location = os.path.join('third_party', 'pkg', 'pub')
-
   with bot.BuildStep('Running pub tests'):
     bot.RunTestRunner(build_info, pub_location)
 
+  dartdoc_location = os.path.join('third_party', 'pkg', 'dartdoc')
+  with bot.BuildStep('Running dartdoc tests'):
+    bot.RunTestRunner(build_info, dartdoc_location)
+
 if __name__ == '__main__':
   bot.RunBot(PubConfig, PubSteps)