Gardening: virtual/threaded/animations/missing-keyframe-properties.html

It times out on linux from time to time

BUG=248938
TEST=
TBR=zmo@chromium.org

Review URL: https://codereview.chromium.org/203983003

git-svn-id: svn://svn.chromium.org/blink/trunk@169481 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -372,6 +372,7 @@ crbug.com/248938 [ Linux Win ] virtual/threaded/animations/matrix-anim.html [ Pa
 crbug.com/248938 [ Win Debug ] virtual/threaded/animations/missing-values-first-keyframe.html [ Pass Timeout ]
 crbug.com/248938 [ Linux Win Debug ] virtual/threaded/animations/missing-from-to-transforms.html [ Pass Timeout ]
 crbug.com/248938 [ Win Debug ] virtual/threaded/animations/missing-keyframe-properties.html [ Pass Timeout ]
+crbug.com/248938 [ Linux ] virtual/threaded/animations/missing-keyframe-properties.html [ Pass Timeout ]
 crbug.com/248938 virtual/threaded/animations/negative-delay.html [ Pass Failure Timeout ]
 crbug.com/248938 [ Debug ] virtual/threaded/animations/opacity-transform-animation.html [ Pass Timeout ]
 crbug.com/248938 virtual/threaded/animations/play-state-initially-paused.html [ Pass Failure ]