Fetch Gerrit cl description from gitiles.

gerrit_util.py

Index: gerrit_util.py
diff --git a/gerrit_util.py b/gerrit_util.py
index 53dc69c0c6d2806231e86f97e520faa7edb0e9ee..9a16a64d3c97cd9977799cbed55b56e76c220e2c 100755
--- a/gerrit_util.py
+++ b/gerrit_util.py
@@ -483,6 +483,17 @@ def GetChangeDetail(host, change, o_params=None):
   return ReadHttpJsonResponse(CreateHttpConn(host, path))
 
 
+def GetChangeDescriptionFromGitiles(url, revision):
+  """Query Gitiles for acutal commit message for a given url and ref.

[scottmg, 2016/04/25 19:15:31]

acutal -> actual

[tandrii(chromium), 2016/04/25 19:20:00]

Done.

+
+  url must be obtained from call to GetChangeDetail for a specific
+  revision (patchset) under 'fetch' key.
+  """
+  parsed = urlparse.urlparse(url)
+  path = '%s/+/%s?format=json' % (parsed.path, revision)
+  return ReadHttpJsonResponse(CreateHttpConn(parsed.netloc, path))['message']
+
+
 def GetChangeCurrentRevision(host, change):
   """Get information about the latest revision for a given change."""
   return QueryChanges(host, {}, change, o_params=('CURRENT_REVISION',))