[proof-of-concept] SW thread independent of the main thread

chrome/browser/push_messaging/push_messaging_service_impl.cc

Index: chrome/browser/push_messaging/push_messaging_service_impl.cc
diff --git a/chrome/browser/push_messaging/push_messaging_service_impl.cc b/chrome/browser/push_messaging/push_messaging_service_impl.cc
index 17387bfe2861060e1a7d1b3ec3dc42c959a6efa2..4627ec5b40b9f9968e19c3bf28d093c2e4356a19 100644
--- a/chrome/browser/push_messaging/push_messaging_service_impl.cc
+++ b/chrome/browser/push_messaging/push_messaging_service_impl.cc
@@ -574,8 +574,9 @@ void PushMessagingServiceImpl::GetEncryptionInfo(
       PushMessagingAppIdentifier::FindByServiceWorker(
           profile_, origin, service_worker_registration_id);
 
-  DCHECK(!app_identifier.is_null());
-
+  // DCHECK(!app_identifier.is_null());
+  if (app_identifier.is_null())
+    return;
   GetGCMDriver()->GetEncryptionInfo(
       app_identifier.app_id(),
       base::Bind(&PushMessagingServiceImpl::DidGetEncryptionInfo,