OS: Android
Bot: android-kitkat-arm-rel
Test suite: chrome_public_test_vr_apk
Test: Several such as 
org.chromium.chrome.browser.vr.WebXrVrTransitionTest#testWindowRafStopsFiringWhilePresenting_WebXr__ChromeTabbedActivity

Failing Run: https://ci.chromium.org/p/chromium/builders/luci.chromium.try/android-kitkat-arm-rel/49943

Some Failures:
   Polling JavaScript boolean javascript Done succeeded, but test failed. Testharness reported failure: 
       - "Harness failed due to timeout. FAIL Screen taps/clicks registered as input when in WebXR immersive session: null. "
       - "Harness failed due to timeout. FAIL Non-immersive rAF stops during immersive session: null. "
       - "Harness failed due to timeout. FAIL Focus is locked to immersive session: null. " 
   java.lang.AssertionError: Immersive session started, but browser not visibly in VR