Mark virtual/gpu/fast/canvas/canvas-lost-gpu-context.html as crashing in debug mode

BUG=327698
TBR=jianli@chromium.org

Review URL: https://codereview.chromium.org/228273002

git-svn-id: svn://svn.chromium.org/blink/trunk@171037 bbb929c8-8fbe-4397-9dbb-9b2b20218538