Add the README.chromium for the symbol and source server scripts.
Add the README.chromium for the symbol and source server scripts.

Review URL: http://codereview.chromium.org/155139


git-svn-id: http://src.chromium.org/svn/trunk/src@20023 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c4103c23052e52c4208d009b79dadc6ec9f97cf3
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