Issue 501916 : Add data type counts to profile deletion flow

components/history/core/browser/history_service.h

Index: components/history/core/browser/history_service.h
diff --git a/components/history/core/browser/history_service.h b/components/history/core/browser/history_service.h
index f197d2bc25d83f65c7c87f2940a416c1a6930cbf..71fda1678d13f8ed2871f74c3383fc4df71f2f0a 100644
--- a/components/history/core/browser/history_service.h
+++ b/components/history/core/browser/history_service.h
@@ -342,6 +342,17 @@ class HistoryService : public syncer::SyncableService, public KeyedService {
       const QueryFilteredURLsCallback& callback,
       base::CancelableTaskTracker* tracker);
 
+  // Statistics ----------------------------------------------------------------
+
+  // Returns the count of URLs in the url database. The argument is the count.
+  // The count is zero if query to the database failed.
+  typedef base::Callback<void(HistoryCountResult)> GetHistoryCountCallback;
+
+  // Returns the count of URLs in the url database.
+  base::CancelableTaskTracker::TaskId GetHistoryCount(
+      const GetHistoryCountCallback& callback,
+      base::CancelableTaskTracker* tracker);
+
   // Database management operations --------------------------------------------
 
   // Delete all the information related to a single url.