Bug 1672649 - Part 2: Notify the observer when there is user-interaction or storage access permission added. r=dimi

We need to report when permission is added in order to wait it
explicitly. These will be put be hind a pref
'privacy.antitracking.testing' and should be only used for testing.

Differential Revision: https://phabricator.services.mozilla.com/D94979

modules/libpref/init/StaticPrefList.yaml

@@ -9168,6 +9168,14 @@
   value: 1800   # 30 minutes (in seconds)
   mirror: always
 
+# Enable Anti-tracking testing. When it enables, it will notify the observers
+# when user-interaction permission or storage access permission is added. This
+# is for testing only.
+- name: privacy.antitracking.testing
+  type: bool
+  value: false
+  mirror: always
+
 # Enable the heuristic to allow storage access for recent visited pages
 - name: privacy.restrict3rdpartystorage.heuristic.recently_visited
   type: bool

toolkit/components/antitracking/ContentBlocking.cpp

@@ -724,6 +724,12 @@ ContentBlocking::SaveAccessForOriginOnParentProcess(
                                      expirationType, when);
   Unused << NS_WARN_IF(NS_FAILED(rv));
 
+  if (StaticPrefs::privacy_antitracking_testing()) {
+    nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
+    obs->NotifyObservers(nullptr, "antitracking-test-storage-access-perm-added",
+                         nullptr);
+  }
+
   if (NS_SUCCEEDED(rv) && (aAllowMode == eAllowAutoGrant)) {
     // Make sure temporary access grants do not survive more than 24 hours.
     TemporaryAccessGrantObserver::Create(permManager, aParentPrincipal, type);

toolkit/components/antitracking/ContentBlockingUserInteraction.cpp

@@ -51,6 +51,12 @@ void ContentBlockingUserInteraction::Observe(nsIPrincipal* aPrincipal) {
                                        nsIPermissionManager::ALLOW_ACTION,
                                        expirationType, when);
     Unused << NS_WARN_IF(NS_FAILED(rv));
+
+    if (StaticPrefs::privacy_antitracking_testing()) {
+      nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
+      obs->NotifyObservers(
+          nullptr, "antitracking-test-user-interaction-perm-added", nullptr);
+    }
     return;
   }