Add ContentSuggestionsCategoryFactory; Store categories as ints

components/ntp_snippets/offline_pages/offline_page_suggestions_provider.h

Index: components/ntp_snippets/offline_pages/offline_page_suggestions_provider.h
diff --git a/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.h b/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.h
index 651342d74d466d188bc2810e07be00f892d4cd60..f899b97deed5af9679765cd1e3764dfd85e5a2b8 100644
--- a/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.h
+++ b/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.h
@@ -12,6 +12,7 @@
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/ntp_snippets/content_suggestion.h"
 #include "components/ntp_snippets/content_suggestions_category.h"
+#include "components/ntp_snippets/content_suggestions_category_factory.h"
 #include "components/ntp_snippets/content_suggestions_category_status.h"
 #include "components/ntp_snippets/content_suggestions_provider.h"
 #include "components/offline_pages/offline_page_model.h"
@@ -32,6 +33,7 @@ class OfflinePageSuggestionsProvider
       public offline_pages::OfflinePageModel::Observer {
  public:
   OfflinePageSuggestionsProvider(
+      ContentSuggestionsCategoryFactory* category_factory,
       offline_pages::OfflinePageModel* offline_page_model);
   ~OfflinePageSuggestionsProvider() override;
 
@@ -40,6 +42,7 @@ class OfflinePageSuggestionsProvider
 
  private:
   // ContentSuggestionsProvider implementation.
+  std::vector<ContentSuggestionsCategory> GetProvidedCategories() override;
   void SetObserver(ContentSuggestionsProvider::Observer* observer) override;
   ContentSuggestionsCategoryStatus GetCategoryStatus(
       ContentSuggestionsCategory category) override;
@@ -71,6 +74,8 @@ class OfflinePageSuggestionsProvider
 
   offline_pages::OfflinePageModel* offline_page_model_;
 
+  const ContentSuggestionsCategory provided_category_;
+
   DISALLOW_COPY_AND_ASSIGN(OfflinePageSuggestionsProvider);
 };