Add failure tests to expectations

The following tests keep failing on Win and Mac. Add them to
TestExpectation and add test owner for review.

TBR=npm@chromium.org
NOTRY=true

Bug: 897775
Change-Id: I14898c603e5a280c747b8d016589c3760a172ee4
Reviewed-on: https://chromium-review.googlesource.com/c/1293995Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601610}

third_party/WebKit/LayoutTests/TestExpectations

@@ -5337,3 +5337,7 @@ crbug.com/895777 external/wpt/infrastructure/assumptions/blank.html [ Failure Cr
 
 #Sheriff 2018-10-18
 crbug.com/896765 [ Linux Mac Win ] http/tests/performance-timing/element-timing/observe-child-element.html [ Failure Pass ]
+
+#Sheriff 2018-10-22
+crbug.com/897775 [ Mac Win ] external/wpt/performance-timeline/webtiming-resolution.any.html [ Failure Pass ]
+crbug.com/897775 [ Mac Win ] external/wpt/performance-timeline/webtiming-resolution.any.worker.html [ Failure Pass ]