Using params:

Bug Id: 724399
Gerrit URL: https://chromium-review.googlesource.com/c/chromium/src/+/1278949
Bot: win-10-perf
Benchmark: memory.desktop

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I get the following output from dev console:

[Deprecation] HTML Imports is deprecated and will be removed in M73, around March 2019. Please use ES modules instead. See https://www.chromestatus.com/features/5144752345317376 for more details.
polymer-micro.html:450 [Deprecation] document.registerElement is deprecated and will be removed in M73, around March 2019. Please use window.customElements.define instead. See https://www.chromestatus.com/features/4642138092470272 for more details.
(anonymous) @ polymer-micro.html:450
(anonymous) @ polymer-micro.html:465
DevTools failed to parse SourceMap: https://pinpoint-dot-chromeperf.appspot.com/components/web-animations-js/web-animations-next-lite.min.js.map
iron-request.html:331 POST https://pinpoint-dot-chromeperf.appspot.com/api/new 500
send @ iron-request.html:331
generateRequest @ iron-ajax.html:484
_makeAjaxRequest @ iron-form.html:346
submit @ iron-form.html:263
submit @ new-job-fab.html:94
handler @ polymer.html:507
fire @ polymer.html:1294
fire @ polymer.html:866
forward @ polymer.html:1163
click @ polymer.html:1148
handleNative @ polymer.html:754
new-job-fab.html:98 Uncaught TypeError: Cannot read property 'error' of null
    at HTMLElement.handleError (new-job-fab.html:98)
    at HTMLElement.handler (polymer.html:507)
    at HTMLElement.fire (polymer.html:1294)
    at HTMLElement._handleFormError (iron-form.html:317)
    at HTMLElement.fire (polymer.html:1294)
    at HTMLElement._handleError (iron-ajax.html:550)
handleError @ new-job-fab.html:98
handler @ polymer.html:507
fire @ polymer.html:1294
_handleFormError @ iron-form.html:317
fire @ polymer.html:1294
_handleError @ iron-ajax.html:550
error (async)
_makeAjaxRequest @ iron-form.html:325
submit @ iron-form.html:263
submit @ new-job-fab.html:94
handler @ polymer.html:507
fire @ polymer.html:1294
fire @ polymer.html:866
forward @ polymer.html:1163
click @ polymer.html:1148
handleNative @ polymer.html:754