Add ListenerRegistration.ListenerTask property.

PiperOrigin-RevId: 315484295

Author: Googler

firestore/src/include/firebase/csharp/document_event_listener.cc

@@ -59,13 +59,12 @@ void DocumentEventListener::DocumentSnapshotEvent(int callback_id,
                                                   DocumentSnapshot value,
                                                   Error error) {
   MutexLock lock(g_mutex);
-  if (error != Error::kOk ||
-      g_document_snapshot_event_listener_callback == nullptr) {
+  if (g_document_snapshot_event_listener_callback == nullptr) {
     return;
   }
   // The ownership is passed through the call to C# handler.
   DocumentSnapshot* copy = new DocumentSnapshot(value);
-  g_document_snapshot_event_listener_callback(callback_id, copy);
+  g_document_snapshot_event_listener_callback(callback_id, copy, error);
 }
 
 }  // namespace csharp

firestore/src/include/firebase/csharp/document_event_listener.h

@@ -27,7 +27,8 @@ namespace csharp {
 // The callbacks that are used by the listener, that need to reach back to C#
 // callbacks.
 typedef void(SWIGSTDCALL* DocumentEventListenerCallback)(int callback_id,
-                                                         void* snapshot);
+                                                         void* snapshot,
+                                                         Error error);
 
 // Provide a C++ implementation of the EventListener for DocumentSnapshot that
 // can forward the calls back to the C# delegates.

firestore/src/include/firebase/csharp/query_event_listener.cc

@@ -54,13 +54,12 @@ ListenerRegistration QueryEventListener::AddListenerTo(
 void QueryEventListener::QuerySnapshotEvent(int callback_id,
                                             QuerySnapshot value, Error error) {
   MutexLock lock(g_mutex);
-  if (error != Error::kOk ||
-      g_query_snapshot_event_listener_callback == nullptr) {
+  if (g_query_snapshot_event_listener_callback == nullptr) {
     return;
   }
   // The ownership is passed through the call to C# handler.
   QuerySnapshot* copy = new QuerySnapshot(value);
-  g_query_snapshot_event_listener_callback(callback_id, copy);
+  g_query_snapshot_event_listener_callback(callback_id, copy, error);
 }
 
 }  // namespace csharp

firestore/src/include/firebase/csharp/query_event_listener.h

@@ -26,7 +26,8 @@ namespace csharp {
 // The callbacks that are used by the listener, that need to reach back to C#
 // callbacks.
 typedef void(SWIGSTDCALL* QueryEventListenerCallback)(int callback_id,
-                                                      void* snapshot);
+                                                      void* snapshot,
+                                                      Error error);
 
 // Provide a C++ implementation of the EventListener for QuerySnapshot that
 // can forward the calls back to the C# delegates.