Add a details link to ct-tree-status.

This is so you can see the non-ellipsized tree status and
also to have a link to the page for opening the tree.

NOTRY=true

Review URL: https://codereview.chromium.org/398653005

git-svn-id: svn://svn.chromium.org/blink/trunk@178537 bbb929c8-8fbe-4397-9dbb-9b2b20218538