Dom_html: add window's scroll{X,Y} properties and scrollTop method

Author: vouillon

lib/js_of_ocaml/dom_html.ml

@@ -2321,8 +2321,14 @@ class type window = object
 
   method blur : unit meth
 
+  method scrollX : number_t readonly_prop
+
+  method scrollY : number_t readonly_prop
+
   method scroll : number_t -> number_t -> unit meth
 
+  method scrollTo : number_t -> number_t -> unit meth
+
   method scrollBy : number_t -> number_t -> unit meth
 
   method sessionStorage : storage t optdef readonly_prop

lib/js_of_ocaml/dom_html.mli

@@ -2165,8 +2165,14 @@ class type window = object
 
   method blur : unit meth
 
+  method scrollX : number_t readonly_prop
+
+  method scrollY : number_t readonly_prop
+
   method scroll : number_t -> number_t -> unit meth
 
+  method scrollTo : number_t -> number_t -> unit meth
+
   method scrollBy : number_t -> number_t -> unit meth
 
   method sessionStorage : storage t optdef readonly_prop