Bug 1498369 - Ensure the promise returned from Document.hasStorageAccess() will propagate user activation r=baku

Differential Revision: https://phabricator.services.mozilla.com/D9011

--HG--
extra : moz-landing-system : lando

dom/base/nsDocument.cpp

@@ -13653,7 +13653,8 @@ nsIDocument::HasStorageAccess(mozilla::ErrorResult& aRv)
     return nullptr;
   }
 
-  RefPtr<Promise> promise = Promise::Create(global, aRv);
+  RefPtr<Promise> promise = Promise::Create(global, aRv,
+                                            Promise::ePropagateUserInteraction);
   if (aRv.Failed()) {
     return nullptr;
   }

toolkit/components/antitracking/test/browser/browser_storageAccessPromiseResolveHandlerUserInteraction.js

@@ -10,6 +10,20 @@ AntiTracking.runTest("Storage Access API returns promises that maintain user act
     });
     ok(!threw, "requestStorageAccess should not throw");
     ok(!rejected, "requestStorageAccess should be available");
+
+    let dwu = SpecialPowers.getDOMWindowUtils(window);
+    let helper = dwu.setHandlingUserInput(true);
+
+    let promise;
+    try {
+      promise = document.hasStorageAccess();
+    } finally {
+      helper.destruct();
+    }
+    await promise.then(_ => {
+      ok(dwu.isHandlingUserInput,
+         "Promise handler must run as if we're handling user input");
+    });
   },
 
   null, // non-blocking callback