Migrate inliner-related tests to a separate unit-test file.

All tests are now GLSL-based instead of .fp based, for ease of
readability. DEF_TESTs which called test() more than once have been
split up into a separate individual DEF_TEST for each test() call, to
simplify fixups going forward.

Change-Id: I9202e95e9cafff3efc0c32aa3f3ca2eea04719fe
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/314886
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
4 files changed