[Sheriff] Expectations for virtual/threaded/http/tests/devtools/tracing/decode-resize.js

The test is flaky on Mac10.13 Tests (dbg)

Bug: 934818
No-try: True
No-presubmit: True
Change-Id: I22fa3d42ac61f35fbd5f54831265895f297177f9
Reviewed-on: https://chromium-review.googlesource.com/c/1483053Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634654}

third_party/blink/web_tests/TestExpectations

@@ -6009,6 +6009,7 @@ crbug.com/934636 virtual/outofblink-cors/http/tests/security/cross-origin-indexe
 crbug.com/934636 virtual/outofblink-cors-ns/http/tests/security/cross-origin-indexeddb-allowed.html [ Crash Pass ]
 crbug.com/934768 [ Mac ] http/tests/devtools/tracing/worker-events.js [ Failure Pass ]
 crbug.com/934768 [ Mac ] virtual/threaded/http/tests/devtools/tracing/worker-events.js [ Failure Pass ]
+crbug.com/934818 [ Mac Debug ] virtual/threaded/http/tests/devtools/tracing/decode-resize.js [ Failure Pass ]
 
 # Device Sensor Events are being restricted to secure browsing contexts, but the change is still gated on a runtime flag.
 crbug.com/932078 http/tests/security/powerfulFeatureRestrictions/device-orientation-future-behavior-on-insecure-origin.html [ Skip ]