Return operation name in prefetch request callback and add internal page hookup

components/offline_pages/core/prefetch/generate_page_bundle_request.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/offline_pages/core/prefetch/generate_page_bundle_request.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "components/offline_pages/core/prefetch/prefetch_proto_utils.h"
@@ skipping 38 matching lines @@
       base::Bind(&GeneratePageBundleRequest::OnCompleted,
                  // Fetcher is owned by this instance.
                  base::Unretained(this)));
 }
 
 GeneratePageBundleRequest::~GeneratePageBundleRequest() {}
 
 void GeneratePageBundleRequest::OnCompleted(PrefetchRequestStatus status,
                                             const std::string& data) {
   if (status != PrefetchRequestStatus::SUCCESS) {
-    callback_.Run(status, std::vector<RenderPageInfo>());
+    callback_.Run(status, std::string(), std::vector<RenderPageInfo>());
     return;
   }
 
   std::vector<RenderPageInfo> pages;
-  if (!ParseOperationResponse(data, &pages)) {
+  std::string operation_name = ParseOperationResponse(data, &pages);
+  if (operation_name.empty()) {
     callback_.Run(PrefetchRequestStatus::SHOULD_RETRY_WITH_BACKOFF,
-                  std::vector<RenderPageInfo>());
+                  std::string(), std::vector<RenderPageInfo>());
     return;
   }
 
-  callback_.Run(PrefetchRequestStatus::SUCCESS, pages);
+  callback_.Run(PrefetchRequestStatus::SUCCESS, operation_name, pages);
 }
 
 }  // offline_pages