Add a simple compositor for Sky

mojo/converters/geometry/geometry_type_converters.cc

Index: mojo/converters/geometry/geometry_type_converters.cc
diff --git a/mojo/converters/geometry/geometry_type_converters.cc b/mojo/converters/geometry/geometry_type_converters.cc
index b87e2f1a413100f84de6bcaec532a4e97f25a4bf..40d8d89ad5e78885845a7c26224104f561841627 100644
--- a/mojo/converters/geometry/geometry_type_converters.cc
+++ b/mojo/converters/geometry/geometry_type_converters.cc
@@ -110,6 +110,19 @@ gfx::Transform TypeConverter<gfx::Transform, TransformPtr>::Convert(
 }
 
 // static
+Size TypeConverter<Size, gfx::Size>::Convert(const gfx::Size& input) {
+  Size size;
+  size.width = input.width();
+  size.height = input.height();
+  return size;
+}
+
+// static
+gfx::Size TypeConverter<gfx::Size, Size>::Convert(const Size& input) {
+  return gfx::Size(input.width, input.height);
+}
+
+// static
 Rect TypeConverter<Rect, gfx::Rect>::Convert(const gfx::Rect& input) {
   Rect rect;
   rect.x = input.x();