Add "Save" link next to profile's sidebar tree element

Each savable profile will have "Save" link next to its title in the sidebar pane when the profile item is selected.

BUG=None

Review URL: https://codereview.chromium.org/149343004

git-svn-id: svn://svn.chromium.org/blink/trunk@166592 bbb929c8-8fbe-4397-9dbb-9b2b20218538