Split ChromePrecompileTest's utilities out into their own file

These utilities need to be reusable for the upcoming AndroidPrecompileTest.

Gerrit does a really bad job on this CL. It is pretty mechanical. I copied ChromePrecompileTest.cpp into PrecompileTestUtils.cpp, and then got things working again.

Bug: b/358074434
Change-Id: If294cf59832276538f623746c1aceb51ac6420f7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/989836
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
4 files changed