Disable flaky virtual/threaded/fast/events/pinch/gesture-pinch-zoom-scroll-bubble.html

BUG=877361
TBR=bokan@chromium.org

Change-Id: Id1bd59c7e430c0c65eeab1a4a9b25d39aa0de9ef
Reviewed-on: https://chromium-review.googlesource.com/1188008Reviewed-by: Hayato Ito <hayato@chromium.org>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585783}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1761,6 +1761,7 @@ crbug.com/613672 [ Mac ] virtual/threaded/synthetic_gestures/synthetic-pinch-zoo
 crbug.com/840017 virtual/threaded/fast/events/pinch/pinch-zoom-into-center.html [ Failure Pass ]
 crbug.com/840017 virtual/threaded/fast/events/pinch/pinch-zoom-pan-position-fixed.html [ Failure Pass ]
 crbug.com/840017 virtual/threaded/fast/events/pinch/pinch-zoom-pan-within-zoomed-viewport.html [ Failure Pass ]
+crbug.com/877361 virtual/threaded/fast/events/pinch/gesture-pinch-zoom-scroll-bubble.html [ Timeout Pass ]
 
 crbug.com/522648 fast/events/touch/compositor-touch-hit-rects-iframes.html [ Crash Failure Pass ]
 crbug.com/522648 virtual/mouseevent_fractional/fast/events/touch/compositor-touch-hit-rects-iframes.html [ Crash Failure Pass ]