Bug 1608588 - Auto-deny `desktop-notification` permission appropriately r=geckoview-reviewers,esawin

This causes us to automatically deny the `desktop-notification`
permission if there is no user interaction, like desktop Firefox. This is
not enforced if the `dom.webnotifications.requireuserinteraction`
preference is set to `false`

Differential Revision: https://phabricator.services.mozilla.com/D60758

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

mobile/android/components/geckoview/GeckoViewPermission.js

@@ -236,6 +236,19 @@ GeckoViewPermission.prototype = {
     }
 
     let perm = types.queryElementAt(0, Ci.nsIContentPermissionType);
+    if (
+      perm.type === "desktop-notification" &&
+      !aRequest.isHandlingUserInput &&
+      Services.prefs.getBoolPref(
+        "dom.webnotifications.requireuserinteraction",
+        true
+      )
+    ) {
+      // We need user interaction and don't have it.
+      aRequest.cancel();
+      return;
+    }
+
     let dispatcher = GeckoViewUtils.getDispatcherForWindow(
       aRequest.window ? aRequest.window : aRequest.element.ownerGlobal
     );

mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/PermissionDelegateTest.kt

@@ -219,6 +219,7 @@ class PermissionDelegateTest : BaseSessionTest() {
     }
 
     @Test fun notification() {
+        sessionRule.setPrefsUntilTestEnd(mapOf("dom.webnotifications.requireuserinteraction" to false))
         mainSession.loadTestPath(HELLO_HTML_PATH)
         mainSession.waitForPageStop()