Add a footer item for the Content Suggestions

ios/chrome/browser/ui/content_suggestions/content_suggestions_footer_item.h

+// 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_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_FOOTER_ITEM_H_
+#define IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_FOOTER_ITEM_H_
+
+#import "base/ios/block_types.h"
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
+#import "ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.h"
+#import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
+
+// Item for a footer of a Content Suggestions section.
+@interface ContentSuggestionsFooterItem
+    : CollectionViewItem<ContentSuggestionIdentification>
+
+// Initialize a footer with a button taking all the space, with a |title| and a
+// |block| run when tapped.
+- (instancetype)initWithType:(NSInteger)type
+                       title:(NSString*)title
+                       block:(ProceduralBlock)block NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)initWithType:(NSInteger)type NS_UNAVAILABLE;
+
+@end
+
+// Corresponding cell for a Content Suggestions' section footer.
+@interface ContentSuggestionsFooterCell : MDCCollectionViewCell
+
+@property(nonatomic, readonly, strong) UIButton* button;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_FOOTER_ITEM_H_