Bug 957768 - Pass the hide subtests option into b2g desktop mochitests, r=jgriffin
Bug 957768 - Pass the hide subtests option into b2g desktop mochitests, r=jgriffin

kartikgupta0909/gittest,walac/build-mozharness,kartikgupta0909/gittest,simar7/build-mozharness,lundjordan/mozharness,escapewindow/mozharness,lundjordan/mozharness,mrrrgn/build-mozharness,kartikgupta0909/build-mozharness,armenzg/build-mozharness,mozilla/build-mozharness,lissyx/build-mozharness,kartikgupta0909/build-mozharness,escapewindow/mozharness,mrrrgn/build-mozharness,kartikgupta0909/mozilla-mozharness,simar7/build-mozharness,mozilla/build-mozharness,kartikgupta0909/mozilla-mozharness,lissyx/build-mozharness,walac/build-mozharness,armenzg/build-mozharness