Summary: Since my new main work maschine is a hdpi device, all the gentests with rounding are producing different outputs. This PR force the scalefactor=1 for gentest to fix issues with generation on hdpi devices. Closes https://github.com/facebook/yoga/pull/434 Differential Revision: D4604724 Pulled By: emilsjolander fbshipit-source-id: ce4036ae71a45775280e0504f20c06a4622ccceb