Backout ea759b57d58a (bug 1223215 part 5) because the removed functions are still useful. r=me.

DONTBUILD because it just adds back a couple of small, unused functions.

gfx/thebes/gfx2DGlue.h

@@ -51,11 +51,21 @@ inline Point ToPoint(const gfxPoint &aPoint)
   return Point(Float(aPoint.x), Float(aPoint.y));
 }
 
+inline Size ToSize(const gfxSize &aSize)
+{
+  return Size(Float(aSize.width), Float(aSize.height));
+}
+
 inline gfxPoint ThebesPoint(const Point &aPoint)
 {
   return gfxPoint(aPoint.x, aPoint.y);
 }
 
+inline gfxSize ThebesSize(const Size &aSize)
+{
+  return gfxSize(aSize.width, aSize.height);
+}
+
 inline gfxRect ThebesRect(const Rect &aRect)
 {
   return gfxRect(aRect.x, aRect.y, aRect.width, aRect.height);