Code:
- Add a non-linear blending bit and makeNonlinearBlending()
to SkColorSpace
- remove enough F16=linear checks to make it possible to
create surfaces and encode pngs with nonlinear F16
Testing:
- add "esrgb" software config to DM, run it
- add "srgbnl" software config, run it
- deemphasize importance of "srgb" config on bots
- update unit tests to reflect relaxed F16 constraints
- add a new unit test file with _really_ basic tests,
and a new unit test that's not working yet
Bug: skia:7942
Change-Id: I8ac042bdf9f3d791765393b68fd9256375184d83
Reviewed-on: https://skia-review.googlesource.com/127325
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
ce4cf72e34