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

ios/chrome/browser/reading_list/reading_list_model_impl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ios/chrome/browser/reading_list/reading_list_model_impl.h"
 
 #include "ios/chrome/browser/reading_list/reading_list_model_storage.h"
 #include "url/gurl.h"
 
 ReadingListModelImpl::ReadingListModelImpl() : ReadingListModelImpl(NULL) {}
@@ skipping 49 matching lines @@
   DCHECK(loaded());
   return unread_[index];
 }
 
 const ReadingListEntry& ReadingListModelImpl::GetReadEntryAtIndex(
     size_t index) const {
   DCHECK(loaded());
   return read_[index];
 }
 
+bool ReadingListModelImpl::CallbackEntryURL(
+    const GURL& url,
+    base::Callback<void(const ReadingListEntry&)> callback) const {
+  DCHECK(loaded());
+  ReadingListEntry entry(url, std::string());
+  auto resultUnread = std::find(unread_.begin(), unread_.end(), entry);
+  if (resultUnread != unread_.end()) {
+    callback.Run(*resultUnread);
+    return true;
+  }
+
+  auto resultRead = std::find(read_.begin(), read_.end(), entry);
+  if (resultRead != read_.end()) {
+    callback.Run(*resultRead);
+    return true;
+  }
+  return false;
+}
+
 void ReadingListModelImpl::RemoveEntryByUrl(const GURL& url) {
   DCHECK(loaded());
   const ReadingListEntry entry(url, std::string());
 
   auto result = std::find(unread_.begin(), unread_.end(), entry);
   if (result != unread_.end()) {
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListWillRemoveUnreadEntry(
                           this, std::distance(unread_.begin(), result)));
     unread_.erase(result);
@@ skipping 158 matching lines @@
 
 void ReadingListModelImpl::EndBatchUpdates() {
   ReadingListModel::EndBatchUpdates();
   if (IsPerformingBatchUpdates() || !storageLayer_) {
     return;
   }
   storageLayer_->SavePersistentUnreadList(unread_);
   storageLayer_->SavePersistentReadList(read_);
   storageLayer_->SavePersistentHasUnseen(hasUnseen_);
 }