Split iccdump code into TestOnly.c helper

Refactor profile parse testing to just compare iccdump output
against golden txt files checked in alongside the icc files.

Bug: skia:
Change-Id: I432364468a6cee5cfe141d91267488ff6d9f05cb
Reviewed-on: https://skia-review.googlesource.com/110720
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
55 files changed