Adding status info to DownloadUIItem and piping it through.

components/offline_pages/core/downloads/download_ui_adapter_unittest.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 <stdint.h>
 
 #include <map>
 #include <memory>
@@ skipping 29 matching lines @@
 static const ClientId kTestClientIdOtherGuid(kLastNNamespace, kTestBadGuid);
 static const ClientId kTestClientId1(kAsyncNamespace, kTestGuid1);
 static const ClientId kTestClientId2(kAsyncNamespace, kTestGuid2);
 static const base::FilePath kTestFilePath =
     base::FilePath(FILE_PATH_LITERAL("foo/bar.mhtml"));
 static const int kFileSize = 1000;
 static const base::Time kTestCreationTime = base::Time::Now();
 static const base::string16 kTestTitle = base::ASCIIToUTF16("test title");
 }  // namespace
 
+// Mock DownloadUIAdapter::Delegate
+class DownloadUIAdapterDelegate : public DownloadUIAdapter::Delegate {
+ public:
+  DownloadUIAdapterDelegate() {
+  }
+  ~DownloadUIAdapterDelegate() override {}
+
+  // DownloadUIAdapter::Delegate
+  bool IsVisibleInUI(const ClientId& client_id) override { return true; }
+  bool IsTemporaryHiddenInUI(const ClientId& client_id) override {
+    return false;
+  }
+};
+
 // Mock OfflinePageModel for testing the SavePage calls.
 class MockOfflinePageModel : public StubOfflinePageModel {
  public:
   MockOfflinePageModel(base::TestMockTimeTaskRunner* task_runner)
       : observer_(nullptr),
         task_runner_(task_runner),
         policy_controller_(new ClientPolicyController()) {
-    adapter.reset(new DownloadUIAdapter(this));
+    DownloadUIAdapterDelegate* delegate = new DownloadUIAdapterDelegate(this, )
+    adapter.reset(new DownloadUIAdapter(this, ));
     // Add one page.
     OfflinePageItem page(GURL(kTestUrl), kTestOfflineId1, kTestClientId1,
                          kTestFilePath, kFileSize, kTestCreationTime);
     page.title = kTestTitle;
     pages[kTestOfflineId1] = page;
   }
 
   ~MockOfflinePageModel() override {}
 
   // OfflinePageModel overrides.
@@ skipping 199 matching lines @@
   model->adapter->RemoveObserver(this);
   // This will complete async fetch of items, but...
   PumpLoop();
   // items should not be loaded when there is no observers!
   EXPECT_FALSE(items_loaded);
   // This should not crash.
   model->adapter->AddObserver(this);
 }
 
 }  // namespace offline_pages