Use the previews black list for offline previews

components/previews/core/previews_io_data.h

Index: components/previews/core/previews_io_data.h
diff --git a/components/previews/core/previews_io_data.h b/components/previews/core/previews_io_data.h
index 5f1efd09b6bd53a8c5f87e5f6021122127f08d20..5dbf65c9fd494d6ed27f03f1a2bc51ec5b96b7c2 100644
--- a/components/previews/core/previews_io_data.h
+++ b/components/previews/core/previews_io_data.h
@@ -6,53 +6,62 @@
 #define COMPONENTS_PREVIEWS_CORE_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/time/time.h"
+#include "components/previews/core/previews_decider.h"
 #include "components/previews/core/previews_opt_out_store.h"
 
 class GURL;
 
+namespace net {
+class URLRequest;
+}
+
 namespace previews {
 class PreviewsBlackList;
 class PreviewsUIService;
 
 // 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 {
+class PreviewsIOData : public PreviewsDecider {
  public:
   PreviewsIOData(
       const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
       const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
-  virtual ~PreviewsIOData();
+  ~PreviewsIOData() override;
 
   // 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,
                   std::unique_ptr<PreviewsOptOutStore> previews_opt_out_store);
 
   // Adds a navigation to |url| to the black list with result |opt_out|.
   void AddPreviewNavigation(const GURL& url, bool opt_out, PreviewsType type);
 
   // Clears the history of the black list between |begin_time| and |end_time|,
   // both inclusive.
   void ClearBlackList(base::Time begin_time, base::Time end_time);
 
   // The previews black list that decides whether a navigation can use previews.
   PreviewsBlackList* black_list() const { return previews_black_list_.get(); }
 
+  // PreviewsDecider implementation:
+  bool ShouldAllowPreview(const net::URLRequest& request,
+                          PreviewsType type) const override;
+
  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(
       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_;