Bug 1501922 [wpt PR 13716] - Update interfaces/cssom-view.idl, a=testonly

Automatic update from web-platform-testsUpdate interfaces/cssom-view.idl (#13716)

Source: https://github.com/tidoust/reffy-reports/blob/a9f000c/whatwg/idl/cssom-view.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/446017586
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wpt-commits: 9ea95501b7e9156875ebfb245b0a085957c20ed9
wpt-pr: 13716

testing/web-platform/tests/interfaces/cssom-view.idl

@@ -41,7 +41,9 @@ partial interface Window {
 
     // client
     [Replaceable] readonly attribute long screenX;
+    [Replaceable] readonly attribute long screenLeft;
     [Replaceable] readonly attribute long screenY;
+    [Replaceable] readonly attribute long screenTop;
     [Replaceable] readonly attribute long outerWidth;
     [Replaceable] readonly attribute long outerHeight;
     [Replaceable] readonly attribute double devicePixelRatio;