Treat already existing saved pages as success.

chrome/browser/android/offline_pages/background_loader_offliner.cc

 // Copyright 2016 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 "chrome/browser/android/offline_pages/background_loader_offliner.h"
 
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/sys_info.h"
 #include "base/time/time.h"
@@ skipping 391 matching lines @@
 
   if (save_state_ == DELETE_AFTER_SAVE) {
     save_state_ = NONE;
     cancel_callback_.Run(request.request_id());
     return;
   }
 
   save_state_ = NONE;
 
   Offliner::RequestStatus save_status;
-  if (save_result == SavePageResult::SUCCESS) {
+  if (save_result == SavePageResult::ALREADY_EXISTS) {
+    save_status = RequestStatus::SAVED;
+  } else if (save_result == SavePageResult::SUCCESS) {
     if (did_snapshot_on_last_retry)
       save_status = RequestStatus::SAVED_ON_LAST_RETRY;
     else
       save_status = RequestStatus::SAVED;
   } else {
     save_status = RequestStatus::SAVE_FAILED;
   }
 
   completion_callback_.Run(request, save_status);
 }
@@ skipping 49 matching lines @@
   // Given the choice between int and double, we choose to implicitly convert to
   // a double since it maintains more precision (we can get a longer time in
   // milliseconds than we can with a 2 bit int, 53 bits vs 32).
   double delay = delay_so_far.InMilliseconds();
   signal_data_.SetDouble(signal_name, delay);
 }
 
 }  // namespace offline_pages
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(offline_pages::OfflinerData);