Adding an expected failure for virtual/softwarecompositing/tiny-layer-rotated.html on Linux.

Started failing as the result of a Chromium change. May just need to be rebaselined.

BUG=287477
TBR=enne

Review URL: https://codereview.chromium.org/23672028

git-svn-id: svn://svn.chromium.org/blink/trunk@157416 bbb929c8-8fbe-4397-9dbb-9b2b20218538