Update ts_library to add definition files more easily
Update ts_library to add definition files more easily

A small change that makes it easier to pull more *.d.ts files into our
TS library usage without having to update the code in multiple places.

Change-Id: If7bb37dca34a1c8882bf00b21d8cc409fd2bccc7
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2100908
Reviewed-by: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>

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