Bug 890097 - Part 4: Fix unit test for FileCopier; r=bustage
Bug 895116: Fix masking with BasicCompositor r=mattwoodrow
Bug 894646 - Various dom deCOM cleanups r=Ms2ger
Bug 895754 - Update VideoPlaybackQuality to current MSE spec (remove playbackJitter, add totalFrameDelay).  r=doublec