The following tests:

WebViewTests/WebViewSurfaceSynchronizationTest.AutosizeBeforeNavigation/0
WebViewTests/WebViewSurfaceSynchronizationTest.AutoSizeHeight/0

are timeout-flaky to lesser or greater extent across most/all of the Windows bots:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=browser_tests&tests=WebViewTests/WebViewSurfaceSynchronizationTest.AutosizeBeforeNavigation/0

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=browser_tests&tests=WebViewTests/WebViewSurfaceSynchronizationTest.AutoSizeHeight/0

Example recent failure:

[ RUN      ] WebViewTests/WebViewSurfaceSynchronizationTest.AutosizeBeforeNavigation/0
[7588:3956:0406/061707.423:WARNING:discovery_network_list_win.cc(195)] Failed to open Wlan client handle: 1062
[7588:2732:0406/061707.431: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=WebViewTests/WebViewSurfaceSynchronizationTest.AutosizeBeforeNavigation/0 --single_process --test-launcher-bot-mode --test-launcher-output="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir1616_32021\results1616_29539\test_results.xml" --test-launcher-summary-output="e:\b\s\w\iom0gpw3\output.json" --user-data-dir="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir1616_32021\d1616_24029" --disable-offline-auto-reload --use-fake-device-for-media-stream --js-flags=--expose-gc --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=SurfaceSynchronization,TestFeatureForBrowserTest1 --disable-features=GuestViewCrossProcessFrames,NetworkPrediction,TestFeatureForBrowserTest2 --flag-switches-begin --flag-switches-end --restore-last-session about:blank


[ RUN      ] WebViewTests/WebViewSurfaceSynchronizationTest.AutoSizeHeight/0
[1088:4668:0406/061706.964: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=WebViewTests/WebViewSurfaceSynchronizationTest.AutoSizeHeight/0 --single_process --test-launcher-bot-mode --test-launcher-output="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir1616_32021\results1616_21302\test_results.xml" --test-launcher-summary-output="e:\b\s\w\iom0gpw3\output.json" --user-data-dir="C:\Users\CHROME~1\AppData\Local\Temp\scoped_dir1616_32021\d1616_15325" --disable-offline-auto-reload --use-fake-device-for-media-stream --js-flags=--expose-gc --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=SurfaceSynchronization,TestFeatureForBrowserTest1 --disable-features=GuestViewCrossProcessFrames,NetworkPrediction,TestFeatureForBrowserTest2 --flag-switches-begin --flag-switches-end --restore-last-session about:blank
[1088:2596:0406/061706.979:WARNING:discovery_network_list_win.cc(195)] Failed to open Wlan client handle: 1062


Assigned components and cc based on /components/guest_view/OWNERS file. I have yet to determine if the flake seems to be caused by anything recent, or if its been around for a while.