[NTP::SectionOrder] Propagate new order through ContentSuggestionsService.

components/ntp_snippets/content_suggestions_service.h

Index: components/ntp_snippets/content_suggestions_service.h
diff --git a/components/ntp_snippets/content_suggestions_service.h b/components/ntp_snippets/content_suggestions_service.h
index 8ad6b60afc2150c8a214d113fbc8a3f95efdc89f..71e42f62553f2b1da30a0d292fa1afd667fb8377 100644
--- a/components/ntp_snippets/content_suggestions_service.h
+++ b/components/ntp_snippets/content_suggestions_service.h
@@ -100,9 +100,10 @@ class ContentSuggestionsService : public KeyedService,
 
   State state() { return state_; }
 
-  // Gets all categories for which a provider is registered. The categories
-  // may or may not be available, see |GetCategoryStatus()|.
-  const std::vector<Category>& GetCategories() const { return categories_; }
+  // Gets all categories for which a provider is registered. The categories may
+  // or may not be available, see |GetCategoryStatus()|. The order in which the
+  // categories are returned is the order in which they should be displayed.
+  const std::vector<Category>& GetCategories();

[Marc Treib, 2016/12/19 13:22:46]

Hm, it's a bit unfortunate that this can't be const anymore.
Since |categories_| has an undefined order now anyway, maybe just return a
sorted copy?

[vitaliii, 2016/12/19 15:28:59]

Done.

 
   // Gets the status of a category.
   CategoryStatus GetCategoryStatus(Category category) const;
@@ -284,9 +285,8 @@ class ContentSuggestionsService : public KeyedService,
   std::map<Category, ContentSuggestionsProvider*, Category::CompareByID>
       dismissed_providers_by_category_;
 
-  // All current suggestion categories, in an order determined by the
-  // |category_factory_|. This vector contains exactly the same categories as
-  // |providers_by_category_|.
+  // All current suggestion categories in undefined order. This vector contains
+  // exactly the same categories as |providers_by_category_|.
   std::vector<Category> categories_;
 
   // All current suggestions grouped by category. This contains an entry for