Bug 814435 - Annotate layers for scrollbars as such. r=tn, BenWa
Bug 814435 - Always layerize overlay scrollbars on B2G. r=tn
Bug 814435 - Apply a shadow transform to scrollbar layers to keep them in sync with async transforms. r=BenWa
Bug 814435 - Prevent scrollbars from fading out while user is scrolling. r=botond