Add an option to package test data to export_tarball script.

It is helpful to have test data in a separate tarball, because
then the main tarball (with everything needed to compile the browser)
can be kept small while still allowing people to run tests as an option.

BUG=none

Review URL: https://codereview.chromium.org/12621004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@186981 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed