Add a full end-to-end test for Background Fetch

content/browser/background_fetch/background_fetch_embedded_worker_test_helper.cc

Index: content/browser/background_fetch/background_fetch_embedded_worker_test_helper.cc
diff --git a/content/browser/background_fetch/background_fetch_embedded_worker_test_helper.cc b/content/browser/background_fetch/background_fetch_embedded_worker_test_helper.cc
index 112dac8a780b2d1b6d431a6190c5af09a117f90a..62c73b2f20e344d743b2934364d9639a1af8a39d 100644
--- a/content/browser/background_fetch/background_fetch_embedded_worker_test_helper.cc
+++ b/content/browser/background_fetch/background_fetch_embedded_worker_test_helper.cc
@@ -31,6 +31,9 @@ void BackgroundFetchEmbeddedWorkerTestHelper::OnBackgroundFetchAbortEvent(
   } else {
     callback.Run(SERVICE_WORKER_OK, base::Time::Now());
   }
+
+  if (abort_event_closure_)
+    abort_event_closure_.Run();
 }
 
 void BackgroundFetchEmbeddedWorkerTestHelper::OnBackgroundFetchClickEvent(
@@ -47,6 +50,9 @@ void BackgroundFetchEmbeddedWorkerTestHelper::OnBackgroundFetchClickEvent(
   } else {
     callback.Run(SERVICE_WORKER_OK, base::Time::Now());
   }
+
+  if (click_event_closure_)
+    click_event_closure_.Run();
 }
 
 void BackgroundFetchEmbeddedWorkerTestHelper::OnBackgroundFetchFailEvent(
@@ -63,6 +69,9 @@ void BackgroundFetchEmbeddedWorkerTestHelper::OnBackgroundFetchFailEvent(
   } else {
     callback.Run(SERVICE_WORKER_OK, base::Time::Now());
   }
+
+  if (fetch_fail_event_closure_)
+    fetch_fail_event_closure_.Run();
 }
 
 void BackgroundFetchEmbeddedWorkerTestHelper::OnBackgroundFetchedEvent(
@@ -79,6 +88,9 @@ void BackgroundFetchEmbeddedWorkerTestHelper::OnBackgroundFetchedEvent(
   } else {
     callback.Run(SERVICE_WORKER_OK, base::Time::Now());
   }
+
+  if (fetched_event_closure_)
+    fetched_event_closure_.Run();
 }
 
 }  // namespace content