Sheriff: Supress failures on...

Sheriff: Supress failures on external/wpt/css/css-animations/CSSAnimation-getComputedTiming.tentative.html

See the issue for details.

Bug: 850349
Change-Id: I776d6d2cc0ba9e4b8265a6366a8a6982dfac2b34
TBR: nhiroki@chromium.org
NOTRY: true
Reviewed-on: https://chromium-review.googlesource.com/1089596Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565131}

third_party/WebKit/LayoutTests/TestExpectations

@@ -4782,3 +4782,6 @@ crbug.com/849975 external/wpt/css/css-animations/Element-getAnimations.tentative
 
 # This won't pass as a layout test until the linked bug is fixed.
 crbug.com/828858 external/wpt/css/selectors/focus-visible-007.html [ Failure ]
+
+# Sheriff 2018-06-07
+crbug.com/850349 external/wpt/css/css-animations/CSSAnimation-getComputedTiming.tentative.html [ Pass Failure ]