Add ContentSuggestionsMediator

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"
+
+@protocol ContentSuggestionsDataSink;
+
+namespace ntp_snippets {
+class ContentSuggestionsService;
+}
+
+// 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
+    NS_DESIGNATED_INITIALIZER;
+- (instancetype)init NS_UNAVAILABLE;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_MEDIATOR_H_