Bug 1523562 [wpt PR 14856] - Update interfaces/user-timing.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/user-timing.idl (#14856)

Source: https://github.com/tidoust/reffy-reports/blob/cc129d4/whatwg/idl/user-timing.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/479750518
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wpt-commits: 6b940f4a127dfdc5e5bda65f90123e9dce3aa356
wpt-pr: 14856

testing/web-platform/tests/interfaces/user-timing.idl

@@ -22,7 +22,8 @@ partial interface Performance {
     void clearMeasures(optional DOMString measureName);
 };
 
-[Exposed=(Window,Worker)]
+[Exposed=(Window,Worker),
+ Constructor(DOMString markName, optional PerformanceMarkOptions markOptions)]
 interface PerformanceMark : PerformanceEntry {
   readonly attribute any detail;
 };