[Offline Pages] Added OfflinePageEvaluationBridge for testing.

components/offline_pages/background/request_notifier.h

Index: components/offline_pages/background/request_notifier.h
diff --git a/components/offline_pages/background/request_notifier.h b/components/offline_pages/background/request_notifier.h
index 7ed907dec954fe7f5a9363fd6e64b90b2fecf9b7..611eac3c4a342c5702d0e65ec3de94aa1ac7126d 100644
--- a/components/offline_pages/background/request_notifier.h
+++ b/components/offline_pages/background/request_notifier.h
@@ -14,6 +14,7 @@ class RequestNotifier {
   // Status to return for failed notifications.
   // NOTE: for any changes to the enum, please also update related switch code
   // in RequestCoordinatorEventLogger.
+  // GENERATED_JAVA_ENUM_PACKAGE:org.chromium.components.offlinepages
   enum class BackgroundSavePageResult {
     SUCCESS,
     PRERENDER_FAILURE,