These are now used in debug.cpp.

Bug: angleproject:5131
Change-Id: Ibe1f0e3e2919a9e2f2b85c3ed80a77617266913e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2451973
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Ian Elliott <ianelliott@google.com>