Pinpoint job:
https://pinpoint-dot-chromeperf.appspot.com/job/11fec213e40000

With and without patch, many test cases (e.g. canvas_75000_pixels_per_second) fail with the following in the log:

(ERROR) 2018-12-04 13:11:22,481 page_test_results.Fail:587  Failure recorded: MapFunctionError: Missing trace config metadata
    at validateTraceCategories (/b/s/w/ir/third_party/catapult/tracing/tracing/metrics/metric_map_function.html:124:28)
    at runMetrics (/b/s/w/ir/third_party/catapult/tracing/tracing/metrics/metric_map_function.html:59:7)
    at metricMapFunction (/b/s/w/ir/third_party/catapult/tracing/tracing/metrics/metric_map_function.html:190:24)
    at Object.mapSingleTrace (/tracing/mre/map_single_trace.html:39:7)
    at eval (/b/s/w/ir/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:61:18)
    at Object.runAndConvertErrorsToFailures (/tracing/mre/map_single_trace.html:24:10)
    at mapSingleTraceWithResult (/b/s/w/ir/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:52:12)
    at Object.mapSingleTraceMain (/b/s/w/ir/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:77:20)
    at eval (/b/s/w/ir/third_party/catapult/tracing/tracing/mre/map_single_trace_cmdline.html:90:15)
    at Object.loadHTMLFile (/b/s/w/ir/third_party/catapult/third_party/vinn/vinn/html_imports_loader.js:140:5)

The test case passes locally with run_benchmark on Linux, so I think it may be something about the way Pinpoint is running the task, but I'm not sure.