Connect ContentSuggestionsMediator to the ContentService

ios/chrome/browser/ui/content_suggestions/content_suggestions_image_updater.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_IMAGE_UPDATER_H_
+#define IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_IMAGE_UPDATER_H_
+
+#import <UIKit/UIKit.h>
+
+@class ContentSuggestionsArticleItem;
+@class ContentSuggestionsImageUpdater;
+
+// Delegate for ContentSuggestionsImageUpdater. It gets notified when the
+// ImageUpdater receives an image.
+@protocol ContentSuggestionsImageUpdaterDelegate
+
+- (void)contentSuggestionsImageUpdater:
+            (ContentSuggestionsImageUpdater*)imageUpdater
+                         receivedImage:(UIImage*)image;
+
+@end
+
+// When receiving an image, it notifies its delegate.
+@interface ContentSuggestionsImageUpdater : NSObject
+
+// Item, and its section identifier, associated with this ImageUpdater. The
+// image updater does not update it in any way.
+@property(nonatomic, weak) ContentSuggestionsArticleItem* item;
+@property(nonatomic, assign) NSInteger sectionIdentifier;
+
+@property(nonatomic, weak) id<ContentSuggestionsImageUpdaterDelegate> delegate;
+
+- (void)receivedImage:(UIImage*)image;

[stkhapugin, 2017/02/14 16:34:19]

Per offline discussion, this is not a great way of doing this plumbing. Can you
hold off with the image logic for this CL altogether? This CL is really huge. 

[gambard, 2017/02/15 10:17:56]

Done.

+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_IMAGE_UPDATER_H_