Web Inspector: [Timeline] Tune status bar UI for limited-width window.
https://bugs.webkit.org/show_bug.cgi?id=112702

Reviewed by Pavel Feldman.

Reduce filter titles when there is not enough space.

* inspector/front-end/TimelinePanel.js: Add classnames to elements.
* inspector/front-end/timelinePanel.css: Specify "flex" behaviour.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146303 268f45cc-cd09-0410-ab3c-d52691b4dbfc