Ephemeral apps should not trigger Chrome background mode

chrome/browser/background/background_application_list_model.cc

Index: chrome/browser/background/background_application_list_model.cc
diff --git a/chrome/browser/background/background_application_list_model.cc b/chrome/browser/background/background_application_list_model.cc
index a7c3a5adff13e54e5c1898415ea9d901c0d06b72..7945c4fb47ba99b807b824143e9c6109a5e41dac 100644
--- a/chrome/browser/background/background_application_list_model.cc
+++ b/chrome/browser/background/background_application_list_model.cc
@@ -25,6 +25,7 @@
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
+#include "extensions/browser/extension_util.h"
 #include "extensions/browser/image_loader.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_icon_set.h"
@@ -310,6 +311,11 @@ bool BackgroundApplicationListModel::IsBackgroundApp(
   // 2) It is a hosted app, and has a background contents registered or in the
   //    manifest.
 
+  // Ephemeral apps are denied any background activity after their event page
+  // has been destroyed, thus they cannot be background apps.
+  if (extensions::util::IsEphemeralApp(extension.id(), profile))
+    return false;
+
   // Not a background app if we don't have the background permission or
   // the push messaging permission
   if (!extension.permissions_data()->HasAPIPermission(