DevTools: add a test for filmstrip recording
DevTools: add a test for filmstrip recording

BUG=496044

Review URL: https://codereview.chromium.org/1182823002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@198204 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk