Add link to WebKit revision log for WebKit rolls.

tools/safely-roll-webkit.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Generate a CL to roll webkit to the specified revision number and post
 it to Rietveld so that the CL will land automatically if it passes the
 commit-queue's checks.
 """
 
@@ skipping 64 matching lines @@
   # Silence the editor.
   os.environ['EDITOR'] = 'true'
 
   old_branch = scm.GIT.GetBranch(root_dir)
   if old_branch == 'webkit_roll':
     parser.error(
         'Please delete the branch webkit_roll and move to a different branch')
   subprocess2.check_output(
       ['git', 'checkout', '-b', 'webkit_roll', options.upstream])
   try:
-    old_rev = process_deps(os.path.join(root_dir, 'DEPS'), new_rev)
+    old_rev = int(process_deps(os.path.join(root_dir, 'DEPS'), new_rev))
     review_field = 'TBR' if options.commit else 'R'
-    commit_msg = 'Webkit roll %s:%s\n\n%s=%s\n' % (old_rev, new_rev,
-                                                   review_field,
-                                                   options.reviewers)
+    commit_msg = ('Webkit roll %s:%s\n'
+                 '\n'
+                 'http://trac.webkit.org/log/?'
+                 'rev=%s&stop_rev=%s&verbose=on\n'
+                 '\n'
+                 '%s=%s\n' % (old_rev, new_rev,
+                              new_rev, old_rev+1,
+                              review_field,
+                              options.reviewers))
     subprocess2.check_output(['git', 'commit', '-m', commit_msg, 'DEPS'])
     subprocess2.check_call(['git', 'diff', options.upstream])
     upload_cmd = ['git', 'cl', 'upload']
     if options.commit:
       upload_cmd.append('--use-commit-queue')
     if options.reviewers:
       upload_cmd.append('--send-mail')
     if options.cc:
       upload_cmd.extend(['--cc', options.cc])
     subprocess2.check_call(upload_cmd)
   finally:
     subprocess2.check_output(['git', 'checkout', old_branch])
     subprocess2.check_output(['git', 'branch', '-D', 'webkit_roll'])
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())