Issue 907726 tracks external/wpt/infrastructure/testdriver/actions/pause.html timing out.
That happens because content::GpuBenchmarking::PointerActionSequence doesn't throw an error when parsing a sequence fails (see the comment about some layout tests failing when that's done). If I uncomment those lines, the error I get is
FAIL TestDriver actions: pause promise_test: Unhandled rejection with value: object "TypeError: we only support action sequence type of pointer"
Comment 1 by bugdroid1@chromium.org
, Oct 10