Add options to install-build-deps.sh to enable unattended mode.
Add options to install-build-deps.sh to enable unattended mode.

BUG=30328
TEST=run with unattended options, verify no prompt

Review URL: http://codereview.chromium.org/549160

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@37120 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser