Bug 883646 - Apply the mDevPixelsPerCSSPixel scaling factor in a few places. r=
Bug 883646 - Fix the zoom clamping in APZC and the resolution calculation. r=
Bug 883646 - Fix zoom-to-rect code in APZC to use a proper definition of zoom. r=
Bug 883646 - Add the LayoutDevicePixel type. r=
Bug 883646 - Propagate the ScaleFactor classes far and wide. r=