SK_GAMMA_EXPONENT usage

Thanks for your help bungeman.

They’re both running on linux with the freetype backend. We’re using a system library of freetype, so I’ll take a look into trying to build it out ourselves and see if that makes a difference. The version of Chromium we’re running is on GPU with our’s being on CPU, however I’ve tried to compare it with Chromium running on the software renderer and it still produces quite a different boldness appearance result. I’m not ruling it out entirely though. We’re also using SkParagraph, so I’ll take a look into the differences there may be on the SkFont settings.