Add mediation for ReadingList distillation state

ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.mm

 // 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.
 
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h"
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/time/time.h"
@@ skipping 256 matching lines @@
         NSIndexPath* addedIndexPath = [self addItem:articleItem
                             toSectionWithIdentifier:sectionIdentifier];
         [indexPaths addObject:addedIndexPath];
         break;
       }
       case ContentSuggestionTypeReadingList: {
         ContentSuggestionsReadingListItem* readingListItem =
             [[ContentSuggestionsReadingListItem alloc]
                      initWithType:ItemTypeReadingList
                               url:suggestion.url
-                distillationState:ReadingListEntry::PROCESSING];
+                distillationState:ReadingListUIDistillationStatusPending];
         readingListItem.title = suggestion.title;
         readingListItem.subtitle = suggestion.publisher;
 
         readingListItem.suggestionIdentifier = suggestion.suggestionIdentifier;
 
         NSIndexPath* addedIndexPath = [self addItem:readingListItem
                             toSectionWithIdentifier:sectionIdentifier];
         [indexPaths addObject:addedIndexPath];
         break;
       }
@@ skipping 168 matching lines @@
   CSCollectionViewModel* model =
       self.collectionViewController.collectionViewModel;
   NSInteger section = [model sectionForSectionIdentifier:sectionIdentifier];
   NSInteger itemNumber = [model numberOfItemsInSection:section];
   [model addItem:item toSectionWithIdentifier:sectionIdentifier];
 
   return [NSIndexPath indexPathForItem:itemNumber inSection:section];
 }
 
 @end