Add author to Change object. Don't set it yet.

It's mostly to be used with the commit queue.

R=dpranke@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/6820076

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@81326 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/git_cl.py b/git_cl.py
index 8cdf131..d0866ca 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -837,8 +837,14 @@
     # with these log messages.
     description = RunCommand(['git', 'log', '--pretty=format:%s%n%n%b',
                               '%s...' % (upstream_branch)]).strip()
-  change = presubmit_support.GitChange(name, description, absroot, files,
-                                       issue, patchset)
+  change = presubmit_support.GitChange(
+      name,
+      description,
+      absroot,
+      files,
+      issue,
+      patchset,
+      None)
 
   # Apply watchlists on upload.
   if not committing: