Bug 1765610 - Add missing check of gamepad testing pref r=dveditz,mccr8

Differential Revision: https://phabricator.services.mozilla.com/D145805

dom/gamepad/ipc/GamepadTestChannelParent.cpp

@@ -8,11 +8,17 @@
 
 #include "mozilla/dom/GamepadPlatformService.h"
 #include "mozilla/ipc/BackgroundParent.h"
+#include "mozilla/StaticPrefs_dom.h"
 #include "mozilla/Unused.h"
 
 namespace mozilla::dom {
 
 already_AddRefed<GamepadTestChannelParent> GamepadTestChannelParent::Create() {
+  // Refuse to create the parent actor if this pref is disabled
+  if (!StaticPrefs::dom_gamepad_test_enabled()) {
+    return nullptr;
+  }
+
   return RefPtr<GamepadTestChannelParent>(new GamepadTestChannelParent())
       .forget();
 }

modules/libpref/init/StaticPrefList.yaml

@@ -2329,7 +2329,7 @@
   mirror: always
 
 - name: dom.gamepad.test.enabled
-  type: bool
+  type: RelaxedAtomicBool
   value: false
   mirror: always