Summary:
Change the cow gltf loading test to validate the texture values and not to validate the renderer output because it has an unstable pixel.
Also a couple of lints.
Reviewed By: patricklabatut
Differential Revision: D29131260
fbshipit-source-id: 5e11f066a2a638588aacb09776cc842173ef669f
Summary: Increase code coverage of shader and re-include them in code coverage test
Reviewed By: nikhilaravi
Differential Revision: D29097503
fbshipit-source-id: 2791989ee1562cfa193f3addea0ce72d6840614a