Bug 1523454 - Expose isParentInterceptEnabled in nsIServiceWorkerManager;r=asuth

Feel free to cancel the review if you already have a patch or if you wanted another approach.
Mostly wrote this patch to make sure the DevTools patch on top of it would work.

Differential Revision: https://phabricator.services.mozilla.com/D19159

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

dom/interfaces/base/nsIServiceWorkerManager.idl

@@ -180,6 +180,8 @@ interface nsIServiceWorkerManager : nsISupports
   void addListener(in nsIServiceWorkerManagerListener aListener);
 
   void removeListener(in nsIServiceWorkerManagerListener aListener);
+
+  bool isParentInterceptEnabled();
 };
 
 %{ C++

dom/serviceworkers/ServiceWorkerManager.cpp

@@ -3010,5 +3010,12 @@ void ServiceWorkerManager::MaybeSendUnregister(nsIPrincipal* aPrincipal,
                                    NS_ConvertUTF8toUTF16(aScope));
 }
 
+NS_IMETHODIMP
+ServiceWorkerManager::IsParentInterceptEnabled(bool* aIsEnabled) {
+  MOZ_ASSERT(NS_IsMainThread());
+  *aIsEnabled = ServiceWorkerParentInterceptEnabled();
+  return NS_OK;
+}
+
 }  // namespace dom
 }  // namespace mozilla