Convert GraphicsContext::drawDisplayList() to the new Skia API

SkCanvas::drawPicture() now takes a matrix, which allows us to avoid
explicit translations.

R=schenney@chromium.org,senorblanco@chromium.org,reed@google.com

Review URL: https://codereview.chromium.org/491883005

git-svn-id: svn://svn.chromium.org/blink/trunk@180723 bbb929c8-8fbe-4397-9dbb-9b2b20218538