use new onDrawPicture variant, as the previous is now deprecated and is no longer called by the base-class.

TBR=fmalita@chromium.org

Review URL: https://codereview.chromium.org/455213002

git-svn-id: svn://svn.chromium.org/blink/trunk@179891 bbb929c8-8fbe-4397-9dbb-9b2b20218538