Avoid calling nextRenderer() in some cases.

BUG=None

Review URL: https://chromiumcodereview.appspot.com/19501004

git-svn-id: svn://svn.chromium.org/blink/trunk@154773 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Adding video resource needed for canvas test

BUG=260292
TBR=senorblanco

Review URL: https://codereview.chromium.org/19697021

git-svn-id: svn://svn.chromium.org/blink/trunk@154774 bbb929c8-8fbe-4397-9dbb-9b2b20218538