Add a message to empty ContentSuggestions sections

ios/chrome/browser/ui/content_suggestions/content_suggestion.h

Index: ios/chrome/browser/ui/content_suggestions/content_suggestion.h
diff --git a/ios/chrome/browser/ui/content_suggestions/content_suggestion.h b/ios/chrome/browser/ui/content_suggestions/content_suggestion.h
index 227275f3fa897f9bff7c81ea009344ac8b165269..ddfff075e2ca1ebf96c81e0257a89d060677dd6a 100644
--- a/ios/chrome/browser/ui/content_suggestions/content_suggestion.h
+++ b/ios/chrome/browser/ui/content_suggestions/content_suggestion.h
@@ -17,6 +17,9 @@ class GURL;
 
 // Enum defining the type of a ContentSuggestions.
 typedef NS_ENUM(NSInteger, ContentSuggestionType) {
+  // Use this type pass information about an empty section. Suggestion of this

[lpromero, 2017/03/23 10:54:37]

"to" pass?

[gambard, 2017/03/23 15:25:49]

Done.

+  // type are empty and should not be displayed.

[lpromero, 2017/03/23 10:54:37]

Why "should not be displayed"? Isn't there a message to display?

[gambard, 2017/03/23 15:25:49]

Comment updated.

+  ContentSuggestionTypeEmpty,
   ContentSuggestionTypeArticle
 };