Bug 1474057 [wpt PR 11836] - Update wpt metadata, a=testonly

wpt-pr: 11836
wpt-type: metadata

testing/web-platform/meta/paint-timing/idlharness.window.js.ini

@@ -0,0 +1,28 @@
+[idlharness.window.html]
+  [PerformancePaintTiming interface: existence and properties of interface object]
+    expected: FAIL
+
+  [PerformancePaintTiming interface object length]
+    expected: FAIL
+
+  [PerformancePaintTiming interface object name]
+    expected: FAIL
+
+  [PerformancePaintTiming interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [PerformancePaintTiming interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [PerformancePaintTiming interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [PerformancePaintTiming must be primary interface of paintTiming]
+    expected: FAIL
+
+  [Stringification of paintTiming]
+    expected: FAIL
+
+  [paint-timing interfaces.]
+    expected: FAIL
+