According to the docs:
https://www.dartlang.org/docs/dart-up-and-running/contents/ch04-tools-dartium.html
In Mac and Linux you can append a --checked but this does not work for Windows.
How do I launch Dartium with the checked flag in Windows?
Apparently, using DART_FLAGS works as well for Windows.
see https://www.dartlang.org/tools/dartium/#using-command-line-flags
Command flags are prefixed with / on Windows, so you use:
C:\path\to\dartium\chrome.exe /DART_FLAGS='--checked'