[Offline Pages] Add new download namespace

components/offline_pages/offline_page_model_impl_unittest.cc

Index: components/offline_pages/offline_page_model_impl_unittest.cc
diff --git a/components/offline_pages/offline_page_model_impl_unittest.cc b/components/offline_pages/offline_page_model_impl_unittest.cc
index 040815a8363854cbfc2a301d0f204b67201db7df..949020930df063e3ad7dd27a4c086b65dc96cc42 100644
--- a/components/offline_pages/offline_page_model_impl_unittest.cc
+++ b/components/offline_pages/offline_page_model_impl_unittest.cc
@@ -1068,6 +1068,15 @@ TEST_F(OfflinePageModelImplTest, CustomTabsNamespace) {
                                   static_cast<int>(SavePageResult::SUCCESS), 1);
 }
 
+TEST_F(OfflinePageModelImplTest, DownloadNamespace) {
+  SavePage(kTestUrl, ClientId(kDownloadNamespace, "123"));
+  std::string histogram_name = "OfflinePages.SavePageResult.";
+  histogram_name += kDownloadNamespace;
+
+  histograms().ExpectUniqueSample(histogram_name,
+                                  static_cast<int>(SavePageResult::SUCCESS), 1);
+}
+
 TEST(CommandLineFlagsTest, OfflineBookmarks) {
   // Disabled by default.
   EXPECT_FALSE(offline_pages::IsOfflineBookmarksEnabled());