Adding ClearBlackList to the PreviewsBlackList and plumbing to UI

components/previews/core/previews_ui_service.h

Index: components/previews/core/previews_ui_service.h
diff --git a/components/previews/core/previews_ui_service.h b/components/previews/core/previews_ui_service.h
index 4fcc4c6094da9bef03c1344db541ea07a27dbc5e..74b9512ba00c9fc800a5b8dc35197128057f33c4 100644
--- a/components/previews/core/previews_ui_service.h
+++ b/components/previews/core/previews_ui_service.h
@@ -7,20 +7,22 @@
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "components/previews/core/previews_opt_out_store.h"
 
+class GURL;
+
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 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 {
@@ -28,20 +30,26 @@ class PreviewsUIService {
   PreviewsUIService(
       PreviewsIOData* previews_io_data,
       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);
 
+  // Adds a navigation to |url| to the black list with result |opt_out|.
+  void AddPreviewNavigation(const GURL& url, PreviewsType type, bool opt_out);
+
+  // Clears the history of the black list between |begin_time| and |end_time|.
+  void ClearBlackList(base::Time begin_time, base::Time end_time);
+
  private:
   // The IO thread portion of the inter-thread communication for previews/.
   base::WeakPtr<previews::PreviewsIOData> io_data_;
 
   base::ThreadChecker thread_checker_;
 
   // The IO thread task runner. Used to post tasks to |io_data_|.
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   base::WeakPtrFactory<PreviewsUIService> weak_factory_;