Allow packaging to run from other directories (e.g. buildbot archive staging area).
Allow packaging to run from other directories (e.g. buildbot archive staging area).

Review URL: http://codereview.chromium.org/43047


git-svn-id: http://src.chromium.org/svn/trunk/src@11390 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 0c38983a138166daeeff8bcba644f9e0a10da9de
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser