Mark a few more virtual/threaded tests as flaky on win debug

Mark the following layout test as flaky on windows debug builds:
  virtual/threaded/animations/animation-hit-test-transform.html
  virtual/threaded/transitions/blendmode-transitions.html
  virtual/threaded/transitions/cubic-bezier-overflow-svg-length.html
  virtual/threaded/animations/compositor-start-event-timing.html

BUG=248938
TBR=ajuma@chromium.org

Review URL: https://codereview.chromium.org/208393018

git-svn-id: svn://svn.chromium.org/blink/trunk@169869 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -412,9 +412,12 @@ crbug.com/248938 [ Linux Win ] virtual/threaded/transitions/transition-end-event
 crbug.com/248938 [ Linux Win ] virtual/threaded/transitions/transition-end-event-unprefixed-04.html [ Pass Failure ]
 crbug.com/248938 [ Linux Win ] virtual/threaded/transitions/transition-end-event-window.html [ Pass Failure ]
 crbug.com/248938 virtual/threaded/animations/timing-properties-do-not-update-running-animation.html [ Pass Failure ]
-crbug.com/248938 [ Win Debug ] virtual/threaded/transitions/cubic-bezier-overflow-svg-length.html [ Pass Timeout ]
 crbug.com/248938 [ Linux Win ] virtual/threaded/animations/cross-fade-background-image.html [ Pass ImageOnlyFailure ]
 crbug.com/352405 virtual/threaded/animations/transition-and-animation-1.html [ Pass Timeout ]
+crbug.com/248938 [ Win Debug ] virtual/threaded/transitions/blendmode-transitions.html [ Pass Timeout ]
+crbug.com/248938 [ Win Debug ] virtual/threaded/transitions/cubic-bezier-overflow-svg-length.html [ Pass Timeout ]
+crbug.com/248938 [ Win Debug ] virtual/threaded/animations/compositor-start-event-timing.html [ Pass Timeout ]
+crbug.com/248938 [ Debug ] virtual/threaded/animations/animation-hit-test-transform.html [ Pass Failure Timeout ]
 
 crbug.com/320477 [ Debug ] inspector/sources/debugger/debugger-pause-in-internal.html [ Pass Crash ]
 crbug.com/347484 [ Debug ] inspector/profiler/canvas2d/canvas-replay-log-grid.html [ Timeout ]