Add test for tag pushing in push-to-trunk script.

BUG=chromium:410721
LOG=n
TEST=script_test.py
TBR=tandrii@chromium.org

Review URL: https://codereview.chromium.org/641633002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24468 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Resolve race between starting the profiler thread and the logging timer

BUG=none
TBR=ishell@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/638943002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24470 ce2b1a6d-e550-0410-aec6-3dcde31c8c00