Bug 1090494, part 1 - Add a RectCornerRadii struct to Moz2D's PathHelpers.h and add variants of AppendRoundedRectToPath and MakePathForRoundedRect that use it. r=mattwoodrow
Bug 1090494, part 2 - Convert the consumers of AppendRoundedRectToPath and MakePathForRoundedRect to use the new RectCornerRadii API. r=mattwoodrow
Bug 1090494, part 3 - Remove the old unused variants of AppendRoundedRectToPath and MakePathForRoundedRect. r=mattwoodrow
Bug 1090494, part 4 - Add AppendRectToPath() and MakePathForRect() helpers to Moz2D's PathHelpers.h. r=mattwoodrow