Add ClearHistory() to ContentSuggestionsService and its providers

components/ntp_snippets/content_suggestions_service_unittest.cc

Index: components/ntp_snippets/content_suggestions_service_unittest.cc
diff --git a/components/ntp_snippets/content_suggestions_service_unittest.cc b/components/ntp_snippets/content_suggestions_service_unittest.cc
index 44eea0160dce362f409cea39f87c159584fefe93..ae6343793be8d36d910e07e5bf9e271c159141a3 100644
--- a/components/ntp_snippets/content_suggestions_service_unittest.cc
+++ b/components/ntp_snippets/content_suggestions_service_unittest.cc
@@ -100,6 +100,10 @@ class MockProvider : public ContentSuggestionsProvider {
     observer()->OnSuggestionInvalidated(this, category, suggestion_id);
   }
 
+  MOCK_METHOD3(ClearHistory,
+               void(base::Time begin,
+                    base::Time end,
+                    base::Callback<bool(const GURL& url)> filter));
   MOCK_METHOD1(ClearCachedSuggestions, void(Category category));
   MOCK_METHOD2(GetDismissedSuggestionsForDebugging,
                void(Category category,
@@ -565,4 +569,14 @@ TEST_F(ContentSuggestionsServiceTest, ShouldPutBookmarksAtEndIfEmpty) {
   EXPECT_THAT(service()->GetCategories(), ElementsAre(remote, bookmarks));
 }
 
+TEST_F(ContentSuggestionsServiceTest, ShouldForwardClearHistory) {
+  Category category = FromKnownCategory(KnownCategories::DOWNLOADS);
+  MockProvider* provider = RegisterProvider(category);
+  base::Time begin = base::Time::FromTimeT(123),
+             end = base::Time::FromTimeT(456);
+  EXPECT_CALL(*provider, ClearHistory(begin, end, _));
+  base::Callback<bool(const GURL& url)> filter;
+  service()->ClearHistory(begin, end, filter);
+}
+
 }  // namespace ntp_snippets