Capture the relevant code-review chit-chat:
> > > rlanday@
> > > seems a little bizarre though that you can
> > > apparently entirely break Mac spellchecking and there's no test for that.

> > noel@
> > Concur, bizarre.  A layout test would overcome any limitations of having unit
> > tests only (which, as we can in the current case, can fail to warn us).

> > xiaochengh@
> Unfortunately layout tests don't run code in components/spellcheck/, so it still
> doesn't cover it...
> I'm thinking a full browser test, since spellchecking goes through all layers of
> Chrome.

I'm wondering: how would a browser test verify that the siggley-red-lines under misspelt are drawn?

I discovered today that this same problem where you can totally break spellcheck without triggering any test cases also exists on Android. Seems that a layout test would be the best way to check that the red underlines are drawn (is there a way to force the spellcheck code to run?).

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