Ntp: show AllDismissedItem when all sections have been dismissed.

components/ntp_snippets/content_suggestions_service.cc

Index: components/ntp_snippets/content_suggestions_service.cc
diff --git a/components/ntp_snippets/content_suggestions_service.cc b/components/ntp_snippets/content_suggestions_service.cc
index f52a9809d09dcae42dbad4cd9a62ff9598870423..6bc5b5eff789b5907f7a7be4494ec15b20617a5a 100644
--- a/components/ntp_snippets/content_suggestions_service.cc
+++ b/components/ntp_snippets/content_suggestions_service.cc
@@ -150,11 +150,18 @@ void ContentSuggestionsService::DismissCategory(Category category) {
   if (providers_it == providers_by_category_.end())
     return;
 
+  dismissed_providers_by_category_[providers_it->first] = providers_it->second;
   providers_by_category_.erase(providers_it);
   categories_.erase(
       std::find(categories_.begin(), categories_.end(), category));
 }
 
+void ContentSuggestionsService::RestoreDismissedCategories() {
+  for (const auto& it : dismissed_providers_by_category_)

[Marc Treib, 2016/10/07 11:40:13]

nit: Please give |it| another name, it's not an iterator.

[Michael van Ouwerkerk, 2016/10/10 16:19:32]

Done.

+    RegisterCategoryIfRequired(it.second, it.first);
+  dismissed_providers_by_category_.clear();
+}
+
 void ContentSuggestionsService::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }