For what it’s worth, this kind of pattern was quite common in the Mac OS X
WebKit API, with public enums in the Objective-C API that exactly matched
private enums inside WebCore and had to be kept in sync.
Over the years, working towards the goal of making WebKit better
cross-platform, we’ve tried to eliminate that, although I suspect there are
some that remain. In some places that means we’re using switch statements to
translate one enum to another, which of course has a bit of runtime cost.
The Chromium use of this sort of pattern may be analogous. Or possibly it’s
different, but just sounds similar.
-- Darin
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