Connect ContentSuggestionsMediator to the ContentService

ios/chrome/browser/ui/content_suggestions/content_suggestion.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_SUGGESTION_H_
 #define IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTION_H_
 
 #import <UIKit/UIKit.h>
 
+#include "url/gurl.h"
+
+@class ContentSuggestionsSectionInformation;
+
+// Enum defining the type of a ContentSuggestions.
+typedef NS_ENUM(NSInteger, ContentSuggestionType) {
+  ContentSuggestionTypeArticle
+};
+
 // Data for a suggestions item, compatible with Objective-C.

[stkhapugin, 2017/02/15 15:35:42]

Optional: maybe something like - objc wrapper for
ntp_snippets::suggestions_item? This way it's easy to understand what is a
suggestions item (I hope the ntp:: class actually has a reasonable description)

[gambard, 2017/02/16 10:06:30]

Well, the description is about the same :D
Done.

 @interface ContentSuggestion : NSObject
 
-@property(nonatomic, copy) NSString* title;
-@property(nonatomic, strong) UIImage* image;
+// Title of the suggestion.
+@property(nonatomic, copy, nullable) NSString* title;
+// Text for the suggestion.
+@property(nonatomic, copy, nullable) NSString* text;
+// Image for the suggestion.
+@property(nonatomic, strong, nullable) UIImage* image;
+// URL associated with the suggestion.
+@property(nonatomic, assign) GURL url;
+
+// Section information in which this suggestion should be.
+@property(nonatomic, strong, nullable)
+    ContentSuggestionsSectionInformation* section;
+@property(nonatomic, assign) ContentSuggestionType type;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTION_H_