Bug 880676 - Introduce a ScaleFactor struct and use it to type conversions between units. r=BenWa,kentuckyfriedtakahe
Bug 880676 - Replace a couple of Rect scaling functions with strongly typed operators. r=
Bug 880676 - Convert WidgetSpaceToCompensatedViewportSpace to the new gfx types. r=kentuckyfriedtakahe
Bug 880676 - Remove ToCSSIntRectRoundIn and convert APZC::CalculateResolution to return a ScaleFactor. r=kentuckyfriedtakahe
Add layout pixels
Try to kill GetDevicePixelsPerMetaViewportPixel