Mark external/wpt/vibration/idlharness.window.js as timeout=long

This is symptomatic of crbug.com/1047818, but to stop the pain for
sheriffs lets mark it timeout=long for now.

Bug: 1073865
Change-Id: I60fa045c61402ec5c6df21c62918df5c109df5cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2163081
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Auto-Submit: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762083}

third_party/blink/web_tests/external/wpt/vibration/idlharness.window.js

 // META: script=/resources/WebIDLParser.js
 // META: script=/resources/idlharness.js
+// META: timeout=long
 
 'use strict';