Add CSDataSource in showcase

ios/showcase/content_suggestions/sc_content_suggestions_item.h

Index: ios/showcase/content_suggestions/sc_content_suggestions_item.h
diff --git a/ios/showcase/content_suggestions/sc_content_suggestions_item.h b/ios/showcase/content_suggestions/sc_content_suggestions_item.h
new file mode 100644
index 0000000000000000000000000000000000000000..a5ae79ae33292e25d2701c070fb23e0e2dc41285
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+++ b/ios/showcase/content_suggestions/sc_content_suggestions_item.h
@@ -0,0 +1,25 @@
+// 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_ITEMS_H_
+#define IOS_SHOWCASE_CONTENT_SUGGESTIONS_SC_CONTENT_SUGGESTIONS_ITEMS_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 ContentSuggetionsCell.
+@interface SCContentSuggestionsItem : CollectionViewItem<SuggestedContent>
+
+@property(nonatomic, copy) NSString* title;
+@property(nonatomic, copy) NSString* subtitle;
+@property(nonatomic, assign) BOOL hasImage;
+@property(nonatomic, copy) NSString* publisher;
+@property(nonatomic, strong) NSDate* publishDate;
+@property(nonatomic, assign) BOOL availableOffline;
+
+@end
+
+#endif  // IOS_SHOWCASE_CONTENT_SUGGESTIONS_SC_CONTENT_SUGGESTIONS_ITEMS_H_