D:\src\chromium\src>out\rel\browser_tests --gtest_filter=ResourceCoordinatorRenderProcessProbeBrowserTest.TrackAndMeasureActiveRenderProcesses --site-per-process
IMPORTANT DEBUGGING NOTE: each test is run inside its own process.
For debugging a test inside a debugger, use the
--gtest_filter=<your_test_name> flag along with either
--single_process (to run the test in one launcher/browser process) or
--single-process (to do the above, and also run Chrome in single-process mode).
Using sharding settings from environment. This is shard 0/1
Using 1 parallel jobs.
Note: Google Test filter = ResourceCoordinatorRenderProcessProbeBrowserTest.TrackAndMeasureActiveRenderProcesses
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from ResourceCoordinatorRenderProcessProbeBrowserTest, where TypeParam =
[ RUN      ] ResourceCoordinatorRenderProcessProbeBrowserTest.TrackAndMeasureActiveRenderProcesses
[3828:8216:0416/081534.222:ERROR:install_util.cc(589)] Unable to create registry key HKLM\SOFTWARE\Policies\Chromium for reading result=2
[3828:7684:0416/081534.305:WARNING:discovery_network_list_win.cc(195)] Failed to open Wlan client handle: 1062
[3828:8216:0416/081534.317:WARNING:chrome_browser_main_win.cc(630)] Command line too long for RegisterApplicationRestart:  --gtest_also_run_disabled_tests --gtest_filter=ResourceCoordinatorRenderProcessProbeBrowserTest.TrackAndMeasureActiveRenderProcesses --single_process --site-per-process --test-launcher-output="D:\src\tmp\scoped_dir13584_24795\results13584_26813\test_results.xml" --user-data-dir="D:\src\tmp\scoped_dir13584_24795\d13584_10225" --disable-offline-auto-reload --no-first-run --no-default-browser-check --enable-logging=stderr --disable-default-apps --wm-window-animations-disabled --disable-component-update --test-type=browser --force-color-profile=srgb --disable-zero-browsers-open-for-tests --ipc-connection-timeout=30 --allow-file-access-from-files --dom-automation --log-gpu-control-list-decisions --disable-backgrounding-occluded-windows --disable-gl-drawing-for-tests --override-use-software-gl-for-tests --force-color-profile=srgb --disable-compositor-ukm-for-tests --enable-features=TestFeatureForBrowserTest1 --disable-features=NetworkPrediction,TestFeatureForBrowserTest2 --flag-switches-begin --flag-switches-end --restore-last-session about:blank
../../chrome/browser/resource_coordinator/resource_coordinator_render_process_probe_browsertest.cc(97): error: Expected equality of these values:
  initial_size + 1u
    Which is: 3
  probe.render_process_info_map_for_testing().size()
    Which is: 2
../../chrome/browser/resource_coordinator/resource_coordinator_render_process_probe_browsertest.cc(109): error: Expected equality of these values:
  initial_size
    Which is: 2
  probe.render_process_info_map_for_testing().size()
    Which is: 1
[3828:8216:0416/081535.906:WARNING:pref_notifier_impl.cc(23)] Pref observer found at shutdown.
[3828:8216:0416/081535.909:WARNING:pref_notifier_impl.cc(23)] Pref observer found at shutdown.
[  FAILED  ] ResourceCoordinatorRenderProcessProbeBrowserTest.TrackAndMeasureActiveRenderProcesses, where TypeParam =  and GetParam() =  (1709 ms)


The failure seems to happen only on Windows 10 (after looking at tryjobs results in https://crrev.com/c/981019)