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..ebfab2817618f1a4c5d9fec220493aaea82f6f9d 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;
 
+  // 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;

[Olivier, 2016/09/20 11:13:44]

we could add a bool read parameter.
wdyt?

In comment, add synchronously

[gambard, 2016/09/20 11:27:33]

I don't see the use case, can you clarify?
The behavior would be: if the bool is true look for an entry in read, if false
look for it everywhere?

[Olivier, 2016/09/20 11:29:50]

The bool parameter is in the callback parameter, not in the method.
The model tells the caller if the found entry is read or not.

[gambard, 2016/09/20 12:07:10]

For now I don't see where this could be used in our code. Unless you think it is
a valuable addition, I will keep this in mind and add it only if I find a use
for it.

+
   // 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