Method to call a method with an entry based on its url

ios/chrome/browser/reading_list/reading_list_model.h

Index: ios/chrome/browser/reading_list/reading_list_model.h
diff --git a/ios/chrome/browser/reading_list/reading_list_model.h b/ios/chrome/browser/reading_list/reading_list_model.h
index 7f76e48525e02ba67ca18849ff966edc27c1c845..9dc2d38240121d75af757cbab94eedcd46297039 100644
--- a/ios/chrome/browser/reading_list/reading_list_model.h
+++ b/ios/chrome/browser/reading_list/reading_list_model.h
@@ -9,6 +9,7 @@
 #include <string>
 #include <vector>
 
+#include "base/callback.h"
 #include "base/observer_list.h"
 #include "ios/chrome/browser/reading_list/reading_list_entry.h"
 #include "ios/chrome/browser/reading_list/reading_list_model_observer.h"
@@ -56,6 +57,13 @@ class ReadingListModel {
   virtual const ReadingListEntry& GetUnreadEntryAtIndex(size_t index) const = 0;
   virtual const ReadingListEntry& GetReadEntryAtIndex(size_t index) const = 0;
 
+  // Synchronously calls the |callback| with entry associated with this |url|.
+  // Does nothing if there is no entry associated.
+  // Returns whether the callback has been called.
+  virtual bool CallbackEntryURL(
+      const GURL& url,
+      base::Callback<void(const ReadingListEntry&)> callback) const = 0;
+
   // Adds |url| at the top of the unread entries, and removes entries with the
   // same |url| from everywhere else if they exist. The addition may be
   // asynchronous, and the data will be available only once the observers are