suppress various svg/dynamic-updates failures after the FCM switch.

Also suppress a virtual/softwarecompositing failure.

TBR=enne@chromium.org
BUG=374936, 374939

Review URL: https://codereview.chromium.org/294753002

git-svn-id: svn://svn.chromium.org/blink/trunk@174317 bbb929c8-8fbe-4397-9dbb-9b2b20218538