Unreviewed rebaseline for virtual/gpu/fast/canvas/canvas-draw-canvas-on-canvas-shadow.html

BUG=383435
TBR=scroggo@chromium.org

Review URL: https://codereview.chromium.org/336213010

git-svn-id: svn://svn.chromium.org/blink/trunk@176571 bbb929c8-8fbe-4397-9dbb-9b2b20218538