"you are using an unsupported command-line flag" incorrectly appears for supported flag

[Liquan (Max) Gu]

I've tried several blink feature flags against

./out/Default/chrome --enable-blink-feature=LongTaskV2

from runtime_enabled_features.json5(https://cs.chromium.org/chromium/src/third_party/WebKit/Source/platform/runtime_enabled_features.json5?q=runtime-enabled-feature+package:%5Echromium$&dr=C&l=2)

which defines all of the blink features, but error appears upon starting the browser that "you are using an unsupported command-line flag". However, the flag has actually been enabled. Just the error message keep appearing.

It doesn't seem to relate to "status: stable/experimental/test/<missing>", cuz I've tried Permission which is stable as well

Is it a bug?

Thanks!

[Brett Wilson]

I don't think that message means the command line flag doesn't work (there's no central repository of flags for Chrome to even know). It means that the use of that flag is not specifically supported by the project so you're on your own if you use that flag and things break.

Brett

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[Achuith Bhandarkar]

We display that warning for flags that are strictly for developer use (including --enable-blink-feature) here. I think you can just ignore the message.

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