Adding a previews IO-thread blacklist

components/previews/previews_ui_service.h

Index: components/previews/previews_ui_service.h
diff --git a/components/previews/previews_ui_service.h b/components/previews/previews_ui_service.h
index 195b0979b82d1d4dd47621ad58888584d25fb0c3..3ae3bc9a99c8af060f76ce274f7242f2ae6e0413 100644
--- a/components/previews/previews_ui_service.h
+++ b/components/previews/previews_ui_service.h
@@ -5,31 +5,34 @@
 #ifndef COMPONENTS_PREVIEWS_PREVIEWS_UI_SERVICE_H_
 #define COMPONENTS_PREVIEWS_PREVIEWS_UI_SERVICE_H_
 
 #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 PreviewsIOData;
 
 // A class to manage the UI portion of inter-thread communication between
 // previews/ objects. Created and used on the UI thread.
 class PreviewsUIService {
  public:
   PreviewsUIService(
       PreviewsIOData* previews_io_data,
-      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
+      std::unique_ptr<PreviewsOptOutStore> previews_opt_out_store);
   virtual ~PreviewsUIService();
 
   // Sets |io_data_| to |io_data| to allow calls from the UI thread to the IO
   // thread. Virtualized in testing.
   virtual void SetIOData(base::WeakPtr<PreviewsIOData> io_data);
 
  private:
   // The IO thread portion of the inter-thread communication for previews/.
   base::WeakPtr<previews::PreviewsIOData> io_data_;