Recently interactive_ui_tests have often failed in Windows CQ bots. An example of that is 
https://ci.chromium.org/buildbot/tryserver.chromium.win/win10_chromium_x64_rel_ng/112283

A lot of tests fail so it seems to be the whole system rather than individual tests. 

In the case above the errors start with:

[22/380] AutofillInteractiveIsolationTest.SimpleCrossSiteFill (1754 ms)
Still waiting for the following processes to finish:
	".\interactive_ui_tests.exe" --brave-new-test-launcher --cfi-diag=0 --gtest_also_run_disabled_tests --gtest_filter=BrowserKeyEventsTest.NormalKeyEvents --single_process --snapshot-output-dir="C:\b\s\w\iokyj2mz" --test-launcher-bot-mode --test-launcher-output="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\results5432_11135\test_results.xml" --test-launcher-summary-output="C:\b\s\w\iokyj2mz\output.json" --user-data-dir="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\d5432_19872"
Still waiting for the following processes to finish:
	".\interactive_ui_tests.exe" --brave-new-test-launcher --cfi-diag=0 --gtest_also_run_disabled_tests --gtest_filter=BrowserKeyEventsTest.NormalKeyEvents --single_process --snapshot-output-dir="C:\b\s\w\iokyj2mz" --test-launcher-bot-mode --test-launcher-output="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\results5432_11135\test_results.xml" --test-launcher-summary-output="C:\b\s\w\iokyj2mz\output.json" --user-data-dir="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\d5432_19872"
[0329/014735.176:ERROR:always_on_top_window_killer_win.cc(123)] Screen snapshot saved to file: "C:\b\s\w\iokyj2mz\ss_20180329014735_097.png" after timeout of test process with command line: "".\interactive_ui_tests.exe" --brave-new-test-launcher --cfi-diag=0 --gtest_also_run_disabled_tests --gtest_filter=BrowserKeyEventsTest.NormalKeyEvents --single_process --snapshot-output-dir="C:\b\s\w\iokyj2mz" --test-launcher-bot-mode --test-launcher-output="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\results5432_11135\test_results.xml" --test-launcher-summary-output="C:\b\s\w\iokyj2mz\output.json" --user-data-dir="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\d5432_19872"".
[ RUN      ] BrowserKeyEventsTest.NormalKeyEvents
[460:5596:0329/014705.144:WARNING:discovery_network_list_win.cc(195)] Failed to open Wlan client handle: 1062
[460:4448:0329/014705.160:WARNING:chrome_browser_main_win.cc(630)] Command line too long for RegisterApplicationRestart:  --brave-new-test-launcher --cfi-diag=0 --gtest_also_run_disabled_tests --gtest_filter=BrowserKeyEventsTest.NormalKeyEvents --single_process --snapshot-output-dir="C:\b\s\w\iokyj2mz" --test-launcher-bot-mode --test-launcher-output="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\results5432_11135\test_results.xml" --test-launcher-summary-output="C:\b\s\w\iokyj2mz\output.json" --user-data-dir="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\d5432_19872" --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
[460:4448:0329/014705.918:INFO:CONSOLE(0)] "[DOM] Password field is not contained in a form: (More info: https://goo.gl/9p2vKq) %o", source: http://127.0.0.1:63421/keyevents_test.html (0)
[460:5172:0329/014705.929:WARNING:embedded_test_server.cc(228)] Request not handled. Returning 404: /favicon.ico
[460:4448:0329/014715.926:ERROR:ui_controls_internal_win.cc(258)] Timed out waiting for mouse move event. The test will now continue, but may fail.
[23/380] BrowserKeyEventsTest.NormalKeyEvents (TIMED OUT)
[ RUN      ] BrowserKeyEventsTest.FocusMenuBarByAltKey
[5348:2528:0329/014735.582:WARNING:discovery_network_list_win.cc(195)] Failed to open Wlan client handle: 1062
[5348:4800:0329/014735.582:WARNING:chrome_browser_main_win.cc(630)] Command line too long for RegisterApplicationRestart:  --brave-new-test-launcher --cfi-diag=0 --gtest_also_run_disabled_tests --gtest_filter=BrowserKeyEventsTest.FocusMenuBarByAltKey --single_process --snapshot-output-dir="C:\b\s\w\iokyj2mz" --test-launcher-bot-mode --test-launcher-output="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\results5432_3714\test_results.xml" --test-launcher-summary-output="C:\b\s\w\iokyj2mz\output.json" --user-data-dir="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir5432_21909\d5432_7603" --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
[5348:4800:0329/014736.288:ERROR:interactive_test_utils_win.cc(67)] ShowAndFocusNativeWindow failed. foreground window: 0000000000020074, title: , path: C:\Windows\System32\EOSNotify.exe
../../chrome/test/base/in_process_browser_test.cc(492): error: Value of: global_browser_set_up_function_(browser_)
  Actual: false
Expected: true

Several things there that look wrong:
* Command line too long?
* Still waiting for the following processes to finish
* Failed to open Wlan client handle: 1062
* Timed out waiting for mouse move event.