Bug 880676 - Convert another gfx::Point to a ScreenPoint. r=
Bug 880676 - Convert some things in APZC::SampleContentTransformForFrame. r=
Bug 880676 - Make the ViewTransform classes store the unscaled layer translation. r=
Bug 880676 - Units.h cleanup for easier reading of future patches. r=
Bug 880676 - Move the RoundToInt functions to be standalone in the gfx headers. r=
Bug 880676 - Introduce a ScaleFactor struct and use it to type conversions between units. r=
Bug 880676 - Replace a couple of Rect scaling functions with strongly typed operators. r=
Bug 880676 - Convert WidgetSpaceToCompensatedViewportSpace to the new gfx types. r=
Bug 880676 - Remove ToCSSIntRectRoundIn and convert APZC::CalculateResolution to return a ScaleFactor. r=