Add an ID to the ContentSuggestion

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

 // Copyright 2017 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_article_item.h"
 
 #include "base/time/time.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ skipping 14 matching lines @@
 #pragma mark - ContentSuggestionsArticleItem
 
 @implementation ContentSuggestionsArticleItem
 
 @synthesize title = _title;
 @synthesize subtitle = _subtitle;
 @synthesize image = _image;
 @synthesize articleURL = _articleURL;
 @synthesize publisher = _publisher;
 @synthesize publishDate = _publishDate;
+@synthesize suggestionIdentifier = _suggestionIdentifier;
 
 - (instancetype)initWithType:(NSInteger)type
                        title:(NSString*)title
                     subtitle:(NSString*)subtitle
                        image:(UIImage*)image
                          url:(const GURL&)url {
   self = [super initWithType:type];
   if (self) {
     self.cellClass = [ContentSuggestionsArticleCell class];
     _title = [title copy];
@@ skipping 108 matching lines @@
   CGFloat parentWidth = CGRectGetWidth(self.contentView.bounds);
   self.subtitleLabel.preferredMaxLayoutWidth =
       parentWidth - self.imageView.bounds.size.width - 3 * 8;
 
   // Re-layout with the new preferred width to allow the label to adjust its
   // height.
   [super layoutSubviews];
 }
 
 @end