This CL enables the auto-roll script to close and reopen the tree when pushing.

Modifies an auto-roll test so that the push-to-trunk part is executed in order to test the new tree control feature.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/130403006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18622 ce2b1a6d-e550-0410-aec6-3dcde31c8c00