Add CSDataSource in showcase

ios/showcase/content_suggestions/sc_content_suggestions_most_visited_item.h

Index: ios/showcase/content_suggestions/sc_content_suggestions_most_visited_item.h
diff --git a/ios/showcase/content_suggestions/sc_content_suggestions_most_visited_item.h b/ios/showcase/content_suggestions/sc_content_suggestions_most_visited_item.h
new file mode 100644
index 0000000000000000000000000000000000000000..21aaba14cc42f8b2b6281f2950a182852308f1e1
--- /dev/null
+++ b/ios/showcase/content_suggestions/sc_content_suggestions_most_visited_item.h
@@ -0,0 +1,21 @@
+// 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.
+
+#ifndef IOS_SHOWCASE_CONTENT_SUGGESTIONS_SC_CONTENT_SUGGESTIONS_MOST_VISITED_ITEM_H_
+#define IOS_SHOWCASE_CONTENT_SUGGESTIONS_SC_CONTENT_SUGGESTIONS_MOST_VISITED_ITEM_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
+#import "ios/chrome/browser/ui/content_suggestions/cells/suggested_content.h"
+
+// Content Suggestions item configuring a ContentSuggetionsMostVisitedCell.
+@interface SCContentSuggestionsMostVisitedItem
+    : CollectionViewItem<SuggestedContent>
+
+@property(nonatomic, copy) NSString* title;
+
+@end
+
+#endif  // IOS_SHOWCASE_CONTENT_SUGGESTIONS_SC_CONTENT_SUGGESTIONS_MOST_VISITED_ITEM_H_