Add idlharness test

Author: Ms2ger

WebCryptoAPI/idlharness-shadowrealm.window.js

@@ -0,0 +1,10 @@
+// META: script=/resources/idlharness-shadowrealm.js
+idl_test_shadowrealm(
+  ['WebCryptoAPI'],
+  ['html', 'dom'],
+  idl_array => {
+    idl_array.add_objects({
+      Crypto: ['crypto'],
+    });
+  }
+);