The following tests:

AutofillMetricsMetricsBrowserTest.CorrectSourceForUnownedAddressCheckout
AutofillMetricsMetricsBrowserTest.CorrectSourceForUnownedCreditCardCheckout
SitePerProcessAutofillMetricsMetricsBrowserTest.CorrectSourceForUnownedCreditCardCheckout

Have been seen flaky on both the commit queue and waterfall:

https://ci.chromium.org/buildbot/tryserver.chromium.mac/mac_chromium_rel_ng/609011
https://ci.chromium.org/buildbot/tryserver.chromium.mac/mac_chromium_rel_ng/609021
https://ci.chromium.org/buildbot/chromium.mac/Mac10.9%20Tests/51294
https://ci.chromium.org/buildbot/chromium.mac/Mac10.9%20Tests/51289
https://ci.chromium.org/buildbot/chromium.mac/Mac10.9%20Tests/51285

Log excerpt is common among all of them:

[ RUN      ] AutofillMetricsMetricsBrowserTest.CorrectSourceForUnownedAddressCheckout
[76720:5123:1208/145728.056108:WARNING:notification_platform_bridge_mac.mm(535)] AlertNotificationService: XPC connection invalidated.
[76720:771:1208/145728.698082:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: autocomplete='name', confirm at https://goo.gl/6KgkJg) %o", source: https://a.com:62846/autofill_unowned_address_checkout.html (0)
[76720:771:1208/145728.698190:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: autocomplete='address-line1', confirm at https://goo.gl/6KgkJg) %o", source: https://a.com:62846/autofill_unowned_address_checkout.html (0)
[76720:771:1208/145728.698283:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: autocomplete='address-level2', confirm at https://goo.gl/6KgkJg) %o", source: https://a.com:62846/autofill_unowned_address_checkout.html (0)
[76720:771:1208/145728.698371:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: autocomplete='address-level1', confirm at https://goo.gl/6KgkJg) %o", source: https://a.com:62846/autofill_unowned_address_checkout.html (0)
[76720:771:1208/145728.698458:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: autocomplete='postal-code', confirm at https://goo.gl/6KgkJg) %o", source: https://a.com:62846/autofill_unowned_address_checkout.html (0)
[76720:771:1208/145728.698544:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: autocomplete='country-name', confirm at https://goo.gl/6KgkJg) %o", source: https://a.com:62846/autofill_unowned_address_checkout.html (0)
[76720:771:1208/145728.698625:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: autocomplete='email', confirm at https://goo.gl/6KgkJg) %o", source: https://a.com:62846/autofill_unowned_address_checkout.html (0)
[76720:771:1208/145728.698701:INFO:CONSOLE(0)] "[DOM] Input elements should have autocomplete attributes (suggested: autocomplete='tel', confirm at https://goo.gl/6KgkJg) %o", source: https://a.com:62846/autofill_unowned_address_checkout.html (0)
../../chrome/browser/autofill/autofill_metrics_browsertest.cc:125: Failure
Expected equality of these values:
  main_frame_url.host()
    Which is: "a.com"
  kv.second->url().host()
    Which is: ""
[76720:771:1208/145728.745469:INFO:chrome_cryptauth_service.cc(233)] Profile is not authenticated yet; waiting before starting CryptAuth managers.
[  FAILED  ] AutofillMetricsMetricsBrowserTest.CorrectSourceForUnownedAddressCheckout, where TypeParam =  and GetParam() =  (843 ms)


Haven't checked to see if these are failing on other platforms.

These tests are preventing valid patches from making it through the CQ. Marking P1.