DevTools: Display submillisecond numbers with 2 decimal places, not 3.
DevTools: Display submillisecond numbers with 2 decimal places, not 3.

BUG=509134

Review URL: https://codereview.chromium.org/1228393003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@198730 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