GetChangeDescriptionFromGitiles followup: future todo for no gitiles.

gerrit_util.py

Index: gerrit_util.py
diff --git a/gerrit_util.py b/gerrit_util.py
index 049c1c28926df10fa74fb8ed7a81ec5d78e82ebc..d9f23de5515e66dff5bbde33f19b8c1ffc7d552b 100755
--- a/gerrit_util.py
+++ b/gerrit_util.py
@@ -491,6 +491,10 @@ def GetChangeDescriptionFromGitiles(url, revision):
   """
   parsed = urlparse.urlparse(url)
   path = '%s/+/%s?format=json' % (parsed.path, revision)
+  # Note: Gerrit instances that Chrome infrastructure uses thus far have all
+  # enabled Gitiles, which allowes us to execute this call. This isn't true for
+  # all Gerrit instances out there. Thus, if line below fails, consider adding a
+  # fallback onto actually fetching ref from remote using pure git.
   return ReadHttpJsonResponse(CreateHttpConn(parsed.netloc, path))['message']