Add an ID to the ContentSuggestion

ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.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_IDENTIFIER_H_
+#define IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTION_IDENTIFIER_H_
+
+#import <Foundation/Foundation.h>
+
+#include <string>
+
+@class ContentSuggestionsSectionInformation;
+
+// An class identifying a suggestion.
+@interface ContentSuggestionIdentifier : NSObject
+
+@property(nonatomic, strong) ContentSuggestionsSectionInformation* sectionInfo;
+// Must be unique inside a section.
+@property(nonatomic, assign) std::string IDInSection;
+
+@end
+
+// A protocol for an object having an ID.
+@protocol ContentSuggestionIdentification
+
+@property(nonatomic, strong) ContentSuggestionIdentifier* suggestionIdentifier;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTION_IDENTIFIER_H_