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

components/offline_pages/core/prefetch/prefetch_proto_utils.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/prefetch_proto_utils.h"
 
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "components/offline_pages/core/prefetch/proto/any.pb.h"
 #include "components/offline_pages/core/prefetch/proto/offline_pages.pb.h"
@@ skipping 105 matching lines @@
                                    std::vector<RenderPageInfo>* pages) {
   if (!operation.has_metadata()) {
     DVLOG(1) << "metadata not found in GeneratePageBundle response";
     return false;
   }
   return ParsePageBundleInAnyData(operation.metadata(), pages);
 }
 
 }  // namespace
 
-bool ParseOperationResponse(const std::string& data,
-                            std::vector<RenderPageInfo>* pages) {
+std::string ParseOperationResponse(const std::string& data,
+                                   std::vector<RenderPageInfo>* pages) {
   proto::Operation operation;
   if (!operation.ParseFromString(data)) {
     DVLOG(1) << "Failed to parse operation";
-    return false;
+    return std::string();
   }
 
-  if (operation.done())
-    return ParseDoneOperationResponse(operation, pages);
-  else
-    return ParsePendingOperationResponse(operation, pages);
+  std::string name = operation.name();
+  bool success = operation.done()
+                     ? ParseDoneOperationResponse(operation, pages)
+                     : ParsePendingOperationResponse(operation, pages);
+  return success ? name : std::string();
 }
 
 }  // namespace offline_pages