Add Snap Start to about:flags

The recent unittests (still pending review) have shown that certificate
errors are correctly piped through, so I think Snap Start is ready for
about:flags, although it's still pretty verbose on the terminal.

BUG=none
TEST=none

http://codereview.chromium.org/4735004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@65680 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed