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ios/chrome/browser/content_suggestions/content_suggestions_mediator.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_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_MEDIATOR_H_
 #define IOS_CHROME_BROWSER_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_MEDIATOR_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/chrome/browser/content_suggestions/content_suggestions_mediator.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_data_source.h"
 
 namespace favicon {
 class LargeIconService;
 }
 
 namespace ntp_snippets {
 class ContentSuggestionsService;
 }
 
+@protocol ContentSuggestionsCommands;
 @class ContentSuggestionIdentifier;
 
 // Mediator for ContentSuggestions. Makes the interface between a
 // ntp_snippets::ContentSuggestionsService and the Objective-C services using
 // its data.
 @interface ContentSuggestionsMediator : NSObject<ContentSuggestionsDataSource>
 
 // Initialize the mediator with the |contentService| to mediate.
-- (instancetype)
-initWithContentService:(ntp_snippets::ContentSuggestionsService*)contentService
-      largeIconService:(favicon::LargeIconService*)largeIconService
+- (nullable instancetype)
+initWithContentService:
+    (nonnull ntp_snippets::ContentSuggestionsService*)contentService
+      largeIconService:(nonnull favicon::LargeIconService*)largeIconService
     NS_DESIGNATED_INITIALIZER;
-- (instancetype)init NS_UNAVAILABLE;
+
+- (nullable instancetype)init NS_UNAVAILABLE;
+
+// Command handler for the mediator.
+@property(nonatomic, weak, nullable) id<ContentSuggestionsCommands>
+    commandHandler;
 
 // Dismisses the suggestion from the content suggestions service. It doesn't
 // change the UI.
-- (void)dismissSuggestion:(ContentSuggestionIdentifier*)suggestionIdentifier;
+- (void)dismissSuggestion:
+    (nonnull ContentSuggestionIdentifier*)suggestionIdentifier;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_MEDIATOR_H_