Adding a previews IO-thread blacklist

components/previews/previews_io_data.h

 // 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.
 
 #ifndef COMPONENTS_PREVIEWS_PREVIEWS_IO_DATA_H_
 #define COMPONENTS_PREVIEWS_PREVIEWS_IO_DATA_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
-#include "base/threading/thread_checker.h"
+#include "base/time/time.h"
+#include "components/previews/previews_opt_out_store.h"
 
 namespace previews {
+class PreviewsBlackList;
 class PreviewsUIService;
+enum class PreviewsType;
 
 // A class to manage the IO portion of inter-thread communication between
 // previews/ objects. Created on the UI thread, but used only on the IO thread
 // after initialization.
 class PreviewsIOData {
  public:
   PreviewsIOData(
       const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
       const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
   virtual ~PreviewsIOData();
 
   // Stores |previews_ui_service| as |previews_ui_service_| and posts a task to
   // InitializeOnIOThread on the IO thread.
-  void Initialize(base::WeakPtr<PreviewsUIService> previews_ui_service);
+  void Initialize(base::WeakPtr<PreviewsUIService> previews_ui_service,
+                  std::unique_ptr<PreviewsOptOutStore> previews_opt_out_store);
+
+  PreviewsBlackList* black_list() { return black_list_.get(); }
 
  protected:
   // Posts a task to SetIOData for |previews_ui_service_| on the UI thread with
   // a weak pointer to |this|. Virtualized for testing.
-  virtual void InitializeOnIOThread();
+  virtual void InitializeOnIOThread(
+      std::unique_ptr<PreviewsOptOutStore> previews_opt_out_store);
 
  private:
   // The UI thread portion of the inter-thread communication for previews.
   base::WeakPtr<PreviewsUIService> previews_ui_service_;
 
+  std::unique_ptr<PreviewsBlackList> black_list_;
+
   // The UI and IO thread task runners. |ui_task_runner_| is used to post
   // tasks to |previews_ui_service_|, and |io_task_runner_| is used to post from
   // Initialize to InitializeOnIOThread as well as verify that execution is
   // happening on the IO thread.
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   base::WeakPtrFactory<PreviewsIOData> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PreviewsIOData);
 };
 
 }  // namespace previews
 
 #endif  // COMPONENTS_PREVIEWS_PREVIEWS_IO_DATA_H_