[Offline Pages] Make prerenderer notify us of network progress.

components/offline_pages/core/downloads/download_ui_adapter.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 "components/offline_pages/core/downloads/download_ui_adapter.h"
 
 #include "base/bind.h"
 #include "base/guid.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 174 matching lines @@
                            weak_ptr_factory_.GetWeakPtr()));
 }
 
 int64_t DownloadUIAdapter::GetOfflineIdByGuid(const std::string& guid) const {
   DownloadUIItems::const_iterator it = items_.find(guid);
   if (it != items_.end())
     return it->second->offline_id;
   return 0;
 }
 
+void DownloadUIAdapter::UpdateProgress(int64_t offline_id, int64_t bytes) {
+  for (auto& item : items_) {
+    if (item.second->is_request && item.second->offline_id == offline_id) {
+      if (bytes == item.second->ui_item->download_progress_bytes)
+        return;
+
+      item.second->ui_item->download_progress_bytes = bytes;
+      for (Observer& observer : observers_)
+        observer.ItemUpdated(*(item.second->ui_item));
+    }
+  }
+}
+
 // Note that several LoadCache calls may be issued before the async GetAllPages
 // comes back.
 void DownloadUIAdapter::LoadCache() {
   state_ = State::LOADING_PAGES;
   model_->GetAllPages(base::Bind(&DownloadUIAdapter::OnOfflinePagesLoaded,
                                  weak_ptr_factory_.GetWeakPtr()));
 }
 
 void DownloadUIAdapter::ClearCache() {
   // Once loaded, this class starts to observe the model. Only remove observer
@@ skipping 99 matching lines @@
   items_.erase(it);
 
   if (state_ != State::LOADED)
     return;
 
   for (Observer& observer : observers_)
     observer.ItemDeleted(guid);
 }
 
 }  // namespace offline_pages