[NTP Snippets] Persist remote categories in prefs

components/ntp_snippets/remote/ntp_snippets_service_unittest.cc

Index: components/ntp_snippets/remote/ntp_snippets_service_unittest.cc
diff --git a/components/ntp_snippets/remote/ntp_snippets_service_unittest.cc b/components/ntp_snippets/remote/ntp_snippets_service_unittest.cc
index 1018c686fd6f5723dcdb267dd6c5ff5ef0e0bca3..c2785da1ebd203f951c91c4fb84aad903e61f055 100644
--- a/components/ntp_snippets/remote/ntp_snippets_service_unittest.cc
+++ b/components/ntp_snippets/remote/ntp_snippets_service_unittest.cc
@@ -738,6 +738,38 @@ TEST_F(NTPSnippetsServiceTest, MultipleCategories) {
   }
 }
 
+TEST_F(NTPSnippetsServiceTest, PersistCategoryInfos) {
+  auto service = MakeSnippetsService();
+
+  LoadFromJSONString(service.get(),
+                     GetMultiCategoryJson({GetSnippetN(0)}, {GetSnippetN(1)}));
+
+  ASSERT_NE(observer().StatusForCategory(articles_category()),
+            CategoryStatus::NOT_PROVIDED);
+  ASSERT_NE(observer().StatusForCategory(other_category()),
+            CategoryStatus::NOT_PROVIDED);
+
+  CategoryInfo info_articles_before =
+      service->GetCategoryInfo(articles_category());
+  CategoryInfo info_other_before = service->GetCategoryInfo(other_category());
+
+  // Recreate the service to simulate a Chrome restart.
+  ResetSnippetsService(&service);
+
+  // The categories should have been restored.
+  ASSERT_NE(observer().StatusForCategory(articles_category()),
+            CategoryStatus::NOT_PROVIDED);
+  ASSERT_NE(observer().StatusForCategory(other_category()),
+            CategoryStatus::NOT_PROVIDED);
+
+  CategoryInfo info_articles_after =
+      service->GetCategoryInfo(articles_category());
+  CategoryInfo info_other_after = service->GetCategoryInfo(other_category());
+
+  EXPECT_EQ(info_articles_before.title(), info_articles_after.title());
+  EXPECT_EQ(info_other_before.title(), info_other_after.title());
+}
+
 TEST_F(NTPSnippetsServiceTest, Clear) {
   auto service = MakeSnippetsService();