Add a testing switch to override the query for other forms of browsing history

components/browsing_data_ui/history_notice_utils.h

Index: components/browsing_data_ui/history_notice_utils.h
diff --git a/components/browsing_data_ui/history_notice_utils.h b/components/browsing_data_ui/history_notice_utils.h
index b6b68e9173df03ea23af392886eae46992fe09e9..c3ab520d5ee69269011cda7091867744b72f8f89 100644
--- a/components/browsing_data_ui/history_notice_utils.h
+++ b/components/browsing_data_ui/history_notice_utils.h
@@ -15,6 +15,16 @@ class WebHistoryService;
 
 namespace browsing_data_ui {
 
+namespace testing {
+
+// TODO(crbug.com/595332): A boolean flag indicating that
+// ShouldShowNoticeAboutOtherFormsOfBrowsingHistory() should skip the query
+// for other forms of browsing history and just assume some such forms were
+// found. Used only for testing. The default is false.
+extern bool g_override_other_forms_of_browsing_history_query;
+
+}
+
 // Whether the Clear Browsing Data UI should show a notice about the existence
 // of other forms of browsing history stored in user's account. The response
 // is returned in a |callback|.