DevTools: [Spectrum] listen to "input" event to update spectrum value
DevTools: [Spectrum] listen to "input" event to update spectrum value

BUG=508422
R=pfeldman

Review URL: https://codereview.chromium.org/1228003002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@198599 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