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

components/offline_pages/core/downloads/download_ui_adapter_unittest.cc

Index: components/offline_pages/core/downloads/download_ui_adapter_unittest.cc
diff --git a/components/offline_pages/core/downloads/download_ui_adapter_unittest.cc b/components/offline_pages/core/downloads/download_ui_adapter_unittest.cc
index f69153205aa23b2196065b70158756624ca5edd2..cb7eac27728f4eb35cdea4dc1a54b43a39420b74 100644
--- a/components/offline_pages/core/downloads/download_ui_adapter_unittest.cc
+++ b/components/offline_pages/core/downloads/download_ui_adapter_unittest.cc
@@ -439,4 +439,21 @@ TEST_F(DownloadUIAdapterTest, RequestBecomesPage) {
   EXPECT_EQ(DownloadUIItem::DownloadState::COMPLETE, item->download_state);
 }
 
+TEST_F(DownloadUIAdapterTest, UpdateProgress) {
+  offliner_stub->enable_callback(true);
+  AddRequest(GURL(kTestUrl), kTestClientId1);
+  PumpLoop();
+
+  int64_t offline_id = adapter->GetOfflineIdByGuid(kTestGuid1);
+  const DownloadUIItem* item = adapter->GetItem(kTestGuid1);
+
+  ASSERT_NE(nullptr, item);
+  EXPECT_EQ(item->download_progress_bytes, 0);
+  updated_guids.clear();
+
+  adapter->UpdateProgress(offline_id, 15);
+  EXPECT_EQ(kTestGuid1, updated_guids[0]);
+  EXPECT_EQ(item->download_progress_bytes, 15);
+}
+
 }  // namespace offline_pages