Fix gcl to pass in the suggested owners properly.

gcl.py

Index: gcl.py
===================================================================
--- gcl.py	(revision 78355)
+++ gcl.py	(working copy)
@@ -323,7 +323,7 @@
         subject = l
       matched_reviewers = reviewers_re.match(l)
       if matched_reviewers:
-        reviewers = matched_reviewers.group(1)
+        reviewers = matched_reviewers.group(1).split(',')
       parsed_lines.append(l)
 
     if len(subject) > 100:
@@ -766,7 +766,7 @@
 def suggest_reviewers(change_info, affected_files):
   owners_db = owners.Database(change_info.GetLocalRoot(), fopen=file,
                               os_path=os.path)
-  return owners_db.reviewers_for(affected_files)
+  return owners_db.reviewers_for([f[1] for f in affected_files])
 
 
 def defer_attributes(a, b):
@@ -1096,12 +1096,13 @@
   affected_files = [x for x in other_files if file_re.match(x[0])]
   unaffected_files = [x for x in other_files if not file_re.match(x[0])]
 
-  suggested_reviewers = suggest_reviewers(change_info, affected_files)
-  if suggested_reviewers:
-    reviewers_re = re.compile(REVIEWERS_REGEX)
-    if not any(
-        reviewers_re.match(l) for l in description.splitlines()):
-      description += '\nR=' + ','.join(suggested_reviewers) + '\n'
+  if not change_info.reviewers:
+    suggested_reviewers = suggest_reviewers(change_info, affected_files)
+    if suggested_reviewers:
+      reviewers_re = re.compile(REVIEWERS_REGEX)
+      if not any(
+          reviewers_re.match(l) for l in description.splitlines()):
+        description += '\nR=' + ','.join(suggested_reviewers) + '\n'
 
   separator1 = ("\n---All lines above this line become the description.\n"
                 "---Repository Root: " + change_info.GetLocalRoot() + "\n"